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نوشته شده در پنجشنبه سی ام آبان 1387 ساعت 13:4 شماره پست: 368
SexFrom Wikipedia, the free encyclopediaJump to: navigation, searchThis article is about biological sex For other uses, such as sexual intercourse and the social concept of gender, see Sex (disambiguation)An organism's sex is defined by the gametes it produces: males produce male gametes (spermatozoa, or sperm) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic Frequently, physical differences are associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience
Sex in animals involves the fusion of a sperm and an egg cellIn biology, sex is a process of combining and mixing genetic traits, often resulting in the specialization of organisms into male and female types (or sexes) Sexual reproduction involves combining specialized cells (gametes) to form offspring that inherit traits from both parents Gametes can be identical in form and function (known as isogametes), but in many cases an asymmetry has evolved such that two sex-specific types of gametes (heterogametes) exist: male gametes are small, motile, and optimized to transport their genetic information over a distance, while female gametes are large, non-motile and contain the nutrients necessary for the early development of the young organism
Contents1 Sexual reproduction 11 Animals 111 Humans 12 Plants 13 Fungi 14 Evolution 2 Sex determination 21 Genetic 22 Nongenetic 3 Sexual dimorphism 4 See also 5 References 6 Notes 7 External links and further reading
Sexual reproductionMain article: sexual reproduction The life cycle of sexually reproducing organisms cycles through haploid and diploid stagesSexual reproduction is a process where organisms form offspring that combine genetic traits from both parents Chromosomes are passed on from one parent to another in this process Each cell has half the chromosomes of the mother and half of the father's[1] Genetic traits are contained within the dioxyribonucleic acid (DNA) of chromosomes — by combining one of each type of chromosomes from each parent, an organism is formed containing a doubled set of chromosomes This double-chromosome stage is called "diploid", while the single chromosome stage is "haploid" Diploid organisms can, in turn, form haploid cells (gametes) that randomly contain one of each of the chromosome pairs, via a process called meiosis[2] Meiosis also involves a stage of chromosomal crossover, in which regions of DNA are exchanged between matched types of chromosomes to form a new pair of mixed chromosomes Crossing over and fertilization (the recombining of single sets of chromosomes to make a new diploid) result in the new organism containing a different set of genetic traits from either parent
In many organisms the haploid stage has been reduced to just gametes specialized to recombine and form a new diploid organism; in others, the gametes are capable of undergoing cell division to produce multicellular haploid organisms In either case, gametes may be externally similar, particularly in size (isogamy), or may have evolved an asymmetry such that the gametes are different in size and other aspects (anisogamy)[3] By convention, the larger gamete (called an ovum, or egg cell) is considered female, while the smaller gamete (called a spermatozoon, or sperm cell) is considered male An individual that produces exclusively large gametes is female, and one that produces exclusively small gametes is male An individual that produces both types of gametes is a hermaphrodite; in some cases hermaphrodites are able to self-fertilize and produce offspring on their own, without a second organism[4]
Hoverflies engaging in sexual intercourseAnimalsAnimal sexual behavior includes mating systems using sexual conflict to a greater extent than simpler organisms Most sexually reproducing animals spend their lives as diploid organisms, with the haploid stage reduced to single cell gametes[5] The gametes of animals have male and female forms—spermatozoa and egg cells These gametes combine to form embryos which develop into a new organism
The male gamete, a spermatozoan (produced within a testicle), is a small cell containing a single long flagellum which propels it[6] Spermatozoa are extremely reduced cells, lacking many cellular components that would be necessary for embryonic development They are specialized for motility, seeking out an egg cell and fusing with it in a process called fertilization
Female gametes are egg cells (produced within ovaries), large immobile cells that contain the nutrients and cellular components necessary for a developing embryo[7] Egg cells are often associated with other cells which support the development of the embryo, forming an egg In mammals, the fertilized embryo instead develops within the female, receiving nutrition directly from its mother
Animals are usually mobile and seek out a partner of the opposite sex for mating Animals which live in the water can mate using external fertilization, where the eggs and sperm are released into and combine within the surrounding water[8] Most animals that live outside of water, however, must transfer sperm from male to female to achieve internal fertilization
In most birds, both excretion and reproduction is done through a single posterior opening, called the cloaca—male and female birds touch cloaca to transfer sperm, a process called "cloacal kissing"[9] In many other terrestrial animals, males use specialized sex organs to assist the transport of sperm—these male sex organs are called intromittent organs In humans and other mammals this male organ is the penis, which enters the female reproductive tract (called the vagina) to achieve insemination—a process called sexual intercourse The penis contains a tube through which semen (a fluid containing sperm) travels In female mammals the vagina connects with the uterus, an organ which directly supports the development of a fertilized embryo within (a process called gestation)
HumansThe biology of human sexuality examines the influence of biological factors, such as organic and neurological response,[10] heredity, hormones, and sexual dysfunction;[11] it examines the basic functions of reproduction and the physical means to carry out sexual intercourse The biological perspective helps to analyze the factors, and ultimately aids in understanding them and using them to deal with sexual problems
Plants Flowers are the sexual organs of flowering plants, usually containing both male and female partsMain article: Plant sexualityLike animals, plants have developed specialized male and female gametes[12] Within most familiar plants, male gametes are contained within hard coats, forming pollen The female gametes of plants are contained within ovules; once fertilized by pollen these form seeds which, like eggs, contain the nutrients necessary for the development of the embryonic plant
Female (left) and male (right) cones are the sex organs of pines and other conifersMany plants have flowers and these are the sexual organs of those plants Flowers are usually hermaphroditic, producing both male and female gametes The female parts, in the center of a flower, are the carpels—one or more of these may be merged to form a single pistil Within carpels are ovules which develop into seeds after fertilization The male parts of the flower are the stamens: these long filamentous organs are arranged between the pistil and the petals and produce pollen at their tips When a pollen grain lands upon the top of a carpel, the tissues of the plant react to transport the grain down into the carpel to merge with an ovule, eventually forming seeds
In pines and other conifers the sex organs are cones and have male and female forms The more familiar female cones are typically more durable, containing ovules within them Male cones are smaller and produce pollen which is transported by wind to land in female cones As with flowers, seeds form within the female cone after pollination
Because plants are immobile, they depend upon passive methods for transporting pollen grains to other plants Many plants, including conifers and grasses, produce lightweight pollen which is carried by wind to neighboring plants Other plants have heavier, sticky pollen that is specialized for transportation by insects The plants attract these insects with nectar-containing flowers Insects transport the pollen as they move to other flowers, which also contain female reproductive organs, resulting in pollination
Mushrooms are produced as part of fungal sexual reproductionFungiMain article: Mating in fungiMost fungi reproduce sexually, having both a haploid and diploid stage in their life cycles These fungi are typically isogamous, lacking male and female specialization: haploid fungi grow into contact with each other and then fuse their cells In some of these cases the fusion is asymmetric, and the cell which donates only a nucleus (and not accompanying cellular material) could arguably be considered "male"[13]
Some fungi, including baker's yeast, have mating types that create a duality similar to male and female roles Yeast with the same mating type will not fuse with each other to form diploid cells, only with yeast carrying the other mating type[14]
Fungi produce mushrooms as part of their sexual reproduction Within the mushroom diploid cells are formed, later dividing into haploid spores—the height of the mushroom aids the dispersal of these sexually produced offspring
Sex helps the spread of advantageous traits through recombination The diagrams compare evolution of allele frequency in a sexual population (a) and an asexual population (b) The vertical axis shows frequency and the horizontal axis shows time The alleles aA and bB occur at random The advantageous combination AB arises rapidly with recombination (a), but must arise independently in (b)EvolutionMain article: Evolution of sexSexual reproduction first appeared about a billion years ago, evolved within ancestral single-celled eukaryotes[15] The reason for the initial evolution of sex, and the reason it has survived to the present, are still matters of debate Some of the many plausible theories include: that sex creates variation among offspring, sex helps in the spread of advantageous traits, and that sex helps in the removal of disadvantageous traits
Sexual reproduction is a process specific to eukaryotes, organisms whose cells contain a nucleus and mitochondria In addition to animals, plants, and fungi, other eukaryotes (eg the malaria parasite) also engage in sexual reproduction Some bacteria use conjugation to transfer genetic material between bacteria; while not the same as sexual reproduction, this also results in the mixture of genetic traits
What is considered defining of sexual reproduction is the difference between the gametes and the binary nature of fertilization Multiplicity of gamete types within a species would still be considered a form of sexual reproduction However, no third gamete is known in multicellular animals[16][17][18]
Sex determinationMain article: Sex-determination systemThe most basic sexual system is one in which all organisms are hermaphrodites, producing both male and female gametes—this is true of some animals (eg snails) and the majority of flowering plants[19] In many cases, however, specialization of sex has evolved such that some organisms produce only male or only female gametes The biological cause for an organism developing into one sex or the other is called sex determination
In the majority of species with sex specialization organisms are either male (producing only male gametes) or female (producing only female gametes) A few exceptions exist—for example, in the roundworm C elegans the two sexes are hermaphrodite and male (a system called androdioecy)
Sometimes an organism's development is intermediate between male and female, a condition called intersex Sometimes intersex individuals are called "hermaphrodite" but, unlike biological hermaphrodites, intersex individuals are unusual cases and are not typically fertile in both male and female aspects
Genetic Like humans and other mammals, the common fruit fly has an XY sex determination systemIn genetic sex determination systems, an organism's sex is determined by the genome it inherits Genetic sex determines usually depends on asymmetrically inherited sex chromosomes which carry genetic features that influence development; sex may be determined either by the presence of a sex chromosome or by how many the organism has Genetic sex determination, because it is determined by chromosome assortment, usually results in a 1:1 ratio of male and female offspring
Humans and other mammals have an XY sex determination system: the Y chromosome carries factors responsible for triggering male development The default sex, in the absence of a Y chromosome, is female Thus, XX mammals are female and XY are male XY sex determination is found in other organisms, including the common fruit fly and some plants[19] In some cases, including in the fruit fly, it is the number of X chromosomes that determines sex rather than the presence of a Y chromosome
In birds, which have a ZW sex-determination system, the opposite is true: the W chromosome carries factors responsible for female development, and default development is male[20] In this case ZZ individuals are male and ZW are female The majority of butterflies and moths also have a ZW sex-determination system In both XY and ZW sex determination systems the sex chromosome carrying the critical factors is often significantly smaller, carrying little more than the genes necessary for triggering the development of a given sex[21]
Many insects use a sex determination system based on the number of sex chromosomes This is called XXXO sex determination—the O indicates the absence of the sex chromosome All other chromosomes in these organisms are diploid, but organisms may inherit one or two X chromosomes In field crickets, for example, insects with a single X chromosome develop as male, while those with two develop as female[22] In the nematode C elegans most worms are self-fertilizing XX hermaphrodites, but occasionally abnormalities in chromosome inheritance regularly give rise to individuals with only one X chromosome—these XO individuals are fertile males (and half their offspring are male)[23]
Other insects, including honey bees and ants, use a haplodiploid sex-determination system[24] In this case diploid individuals are generally female, and haploid individuals (which develop from unfertilized eggs) are male This sex-determination system results in highly biased sex ratios, as the sex of offspring is determined by fertilization rather than the assortment of chromosomes during meiosis
Clownfish are initially male; the largest fish in a group becomes femaleNongeneticFor many species sex is not determined by inherited traits, but instead by environmental factors experienced during development or later in life Many reptiles have temperature-dependent sex determination: the temperature embryos experience during their development determines the sex of the organism In some turtles, for example, males are produced at lower incubation temperatures than females; this difference in critical temperatures can be as little as 1-2°C
Many fish change sex over the course of their lifespan, a phenomenon called sequential hermaphroditism In clownfish, smaller fish are male, and the dominant and largest fish in a group becomes female In many wrasses the opposite is true—most fish are initially female and become male when they reach a certain size Sequential hermaphrodites may produce both types of gametes over the course of their lifetime, but at any given point they are either female or male
In some ferns the default sex is hermaphrodite, but ferns which grow in soil that has previously supported hermaphrodites are influenced by residual hormones to instead develop as male[25]

Sexual dimorphism Common pheasants are sexually dimorphic in both size and appearanceMain article: sexual dimorphismMany animals have differences between the male and female sexes in size and appearance, a phenomenon called sexual dimorphism Sexual dimorphisms are often associated with sexual selection - the competition between individuals of one sex to mate with the opposite sex[26] Antlers in male deer, for example, are used in combat between males to win reproductive access to female deer In many cases the male of a species is larger in size; in mammals species with high sexual size dimorphism tend to have highly polygynous mating systems—presumably due to selection for success in competition with other males
Other animals, including most insects and many fish, have larger females This may be associated with the cost of producing egg cells, which requires more nutrition than producing sperm—larger females are able to produce more eggs[27] Occasionally this dimorphism is extreme, with males reduced to living as parasites dependent on the female
In birds, males often have a more colorful appearance and may have features (like the long tail of male peacocks) that would seem to put the organism at a disadvantage (eg bright colors would seem to make a bird more visible to predators) One proposed explanation for this is the handicap principle[28] This hypothesis says that, by demonstrating he can survive with such handicaps, the male is advertising his genetic fitness to females—traits that will benefit daughters as well, who will not be encumbered with such handicaps
Sex differences in humans include, generally, a larger size and more body hair in men; women have breasts, wider hips, and a higher body fat percentage
See alsoSexual conflict
ReferencesAlberts B, Johnson A, Lewis J, Raff M, Roberts K, and Walter P (2002) Molecular Biology of the Cell, 4th edition ISBN 0-8153-3218-1 Gilbert SF (2000) Developmental Biology, 6th edition, Sinauer Associates, Inc ISBN 0-87893-243-7
Notes^ Alberts et al (2002), V 20 The Benefits of Sex ^ Alberts et al (2002), V 20 Meiosis ^ Gilbert (2000), 12 Multicellularity: The Evolution of Differentiation ^ Alberts et al (2002), V 21 Caenorhabditis Elegans: Development from the Perspective of the Individual Cell ^ Alberts et al (2002), 3 Mendelian genetics in eukaryotic life cycles ^ Alberts et al (2002), V20 Sperm ^ Alberts et al (2002), V20 Eggs ^ Alberts et al (2002), V20 Fertilization ^ Ritchison G "Avian Reproduction" Eastern Kentucky University Retrieved on 2008-04-03 ^ Ellen Ross, Rayna Rapp Sex and Society: A Research Note from Social History and Anthropology Comparative Studies in Society and History, Vol 23, No 1 (Jan, 1981), pp 51-72 ^ (Rathus et al McKenzie, pp 18) ^ Gilbert (2000), 420 Gamete Production in Angiosperms ^ Nick Lane (2005) Power, Sex, Suicide: Mitochondria and the Meaning of Life Oxford University Press, 236-237 ISBN 0192804812 ^ Matthew P Scott, Paul Matsudaira, Harvey Lodish, James Darnell, Lawrence Zipursky, Chris A Kaiser, Arnold Berk, Monty Krieger (2000) Molecular Cell Biology, Fourth Edition, WH Freeman and Co 141 Cell-Type Specification and Mating-Type Conversion in Yeast ^ "Book Review for Life: A Natural History of the First Four Billion Years of Life on Earth" Jupiter Scientific Retrieved on 2008-04-07 ^ Amanda Schaffer, Pas de Deux: Why Are There Only Two Sexes?, Slate updated 27 September, 2007 ^ Laurence D Hurst, 'Why are There Only Two Sexes?', Proceedings: Biological Sciences 263 (1996): 415-422 ^ ES Haag, 'Why two sexes? Sex determination in multicellular organisms and protistan mating types', Seminars in Cell and Developmental Biology 18 (2007): 348-9 ^ a b Dellaporta SL, Calderon-Urrea A (1993) "Sex Determination in Flowering Plants" The Plant Cell 5: 1241–1251 doi:1023073869777 ^ Smith CA, Katza M, Sinclair AH (2003) "DMRT1 Is Upregulated in the Gonads During Female-to-Male Sex Reversal in ZW Chicken Embryos" Biology of Reproduction 68: 560–570 doi:101095biolreprod102007294 PMID 12533420 ^ "Evolution of the Y Chromosome" Annenberg Media Retrieved on 2008-04-01 ^ Yoshimura A (2005) "Karyotypes of two American field crickets: Gryllus rubens and Gryllus sp (Orthoptera: Gryllidae)" Entomological Science 8 (3): 219–222 doi:101111j1479-8298200500118x ^ Riddle DL, Blumenthal T, Meyer BJ, Priess JR (1997) C Elegans II Cold Spring Harbor Laboratory Press ISBN 0-87969-532-3 9II Sexual Dimorphism ^ Charlesworth B (2003) "Sex Determination in the Honeybee" Cell 114 (4): 397–398 doi:101016S0092-8674(03)00610-X ^ Tanurdzic M and Banks JA (2004) "Sex-Determining Mechanisms in Land Plants" The Plant Cell 16: S61–S71 doi:101105tpc016667 PMID 15084718 ^ Darwin C (1871) The Descent of Man and Selection in Relation to Sex Murray, London ^ Stuart-Smith J, Swain R, Stuart-Smith R, Wapstra E (2007) "Is fecundity the ultimate cause of female-biased size dimorphism in a dragon lizard?" Journal of Zoology 273 (3): 266–272 doi:101111j1469-7998200700324x ^ Zahavi, A and Zahavi, A (1997) The handicap principle: a missing piece of Darwin's puzzle Oxford University Press Oxford ISBN 0-19-510035-2
External links and further readingFind more about Sex on Wikipedia's sister projects: Dictionary definitions Textbooks Quotations Source texts Images and media News stories Learning resources Human Sexual Differentiation by P C Sizonenko New Scientist article on Sex chromosomes in the platypus Maynard-Smith, J The Evolution of Sex Cambridge University Press, 1978 Arnqvist, G & Rowe, L (2005) Sexual conflict Princeton University Press, Princeton ISBN 0691122172 Retrieved from "http:enwikipediaorgwikiSex"Categories: Sex BiologyHidden category: Semi-protectedViewsArticle Discussion View source History Personal toolsLog in create account NavigationMain page Contents Featured content Current events Random article Search
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The girls from Pitchman talk in the Hot Tub between takes of PITCHMAN while they thought the camera's weren't rolling The topic turns t
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From Liv Films More Entertainment 05:25 PITCHMAN 16 "Lets Get NAKED And Have Sex" 30-Oct-07 Rated 418 104,362 Views 2 Comments
Season 2 finale of PITCHMAN Eve ends up trying the webcam sex business with her friends while the rest of the gang head off in their di
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From shakkky_1987 More Comedy, Entertainment, People & Stories 00:47 Rebecca Romijn And Antonio Banderas Wwwsex-3rbicom 06-Jun-06 Rated 419 336,030 Views 13 Comments
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نوشته شده در پنجشنبه سی ام آبان 1387 ساعت 13:28 شماره پست: 370

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Thursday, November 13, 2008Gel
I am annoying Very annoying I am well aware I might irritate people and not only because I’m incredibly bossy, stupidly neurotic, or due to my frequently laughing at my own, unfunny, jokes No, besides all that, there’s another reason I get on some folks’ nerves and it is this: I orgasm very, very easily
Back in the days when this blog was just an anonymous obsession (rather than it now being a slightly embarrassing invisible pair of knickers which permanently hang around my ankles, tripping me up), I was often accused of being a man jotting down his sexual fantasies ‘Women don’t thinktalkbehave like that about sex!’ people would shout in the comment box, adding, ‘and women certainly don’t come like a fucking train all the time – that’s for sure’ Well, if we were talking steam trains, then I agree, but if it’s the new fast-tilting-super-powered machines we’re likening my orgasms to, then yes, a “fucking train” I am
I haven’t always come easily, but after I hit my mid-twenties, and certainly upon turning thirty, climaxing, for me, has never been about ‘if’, but only about ‘how many times in one session?’ I’m not one of those women of whom only 34% orgasm regularly: I come easily; I come often; I come hard; I always orgasm through penetration and usually forgo, by choice, receiving prolonged foreplay: I’d prefer a cock inside me now, thanks I, frequently will come, fully clothed, just from a brief dry hump; I’ll come even if a guy isn’t great in bed because I know how to position my body just so, to get me off; and if a guy is skilled in the bedroom department, I’ll come even harder as a result I like my orgasms, thank you very much, and whilst the journey getting there is wonderful, I’m much more partial to the destination It’s not just the release of endorphins and pleasure that I enjoy; I’m also less moody as a result of climaxing, which is a bonus, I think (NB Any potential future partners reading this please take note)
I’m sure some women might scan this post and think ‘Bitch’, or ‘Why can’t I come like her?’, or, even, ‘Focussing on orgasms means that those women who have difficulty climaxing won’t enjoy sex’ For that I apologise I’m sorry if the truthful description of my orgasm pursuit or pleasure makes any women feel inadequate, or frustrated, or annoyed; that is not my intention The reason I’m writing about my orgasms is because I just tried something that I think will help other women obtain them easier, and I’m all for more women climaxing (Yay!)
Durex recently asked me if I’d like to try their new Play O Orgasm Gel for Women, which supposedly will “revolutionise” women's sex lives I scoffed to myself when I read the blurb and then sent back a snarky reply saying, ‘I’m really not sure that I need it’ I think I probably sniggered, too, self-righteous prat that I am But they responded tactfully, and argued that the gel was not only to achieve orgasm, but to actually enhance the sensation of it too: perhaps I’d still like to give it a go? What the hell: more intense orgasms? Oh, if you insist Let’s call it a scientific test for womanhood
And try it I did, with a cynical outlook and, most likely, a jaded expression on my face, crap sexblogger that I am After watching some titillating gay porn (boy-boy never fails to arouse me: my Sylar+Peter Petrelli fantasy has kept me going on many a cold night), I rubbed a tiny drop of gel between my legs and sixty seconds later, WOW One minute I was yawning with bored anticipation and the next I was wondering how the fuck everything felt so simultaneously cold and hot and engorged and OMFG I need to come right now stick it in me oh fuck yes To say I was surprised was an understatement I really thought the gel would do nothing for me, but I went from 0-60 in sixty seconds: it was full-on, volume-up-to-11 arousal, within a minute of use – without any other stimulation Look mum, no hands! (Although I obviously then put them to good use, immediately) With the gel making the entire area between my legs thrum like a fucking motor, it took me almost no time at all to climax, which I did, intensely, and, after I had recovered, my first thought was: this is like female Viagra My second thought: all women should try this Now
Durex claim that 74% of the women who have used this gel are able to obtain an orgasm regularly and whilst I usually don’t swallow such hype, given the impressive effect this product had on me, I actually believe their statistic I’m not suggesting that this gel will enable immediate access to orgasms (or the frequency of them that I manage) but if it offers almost instant arousal, and deeply happy throbbing, then that’s good in my book And if it helps some more women to climax too, then it’s a no brainer for me to recommend it You can obtain the gel here and I am genuinely interested in hearing other women’s opinions and experiences of it
posted by thegirl @ 10:39:00 PMTuesday, October 21, 2008Reload
Things I am doing today: repeatedly clicking 'reload page' here and grinning, widely, from ear to ear, as I watch the donations increase, and the silent majority finally speaking out
It's a brilliant campaign: I cannot wait to see the posters on the buses
posted by thegirl @ 3:15:00 PMSunday, October 12, 2008Opportunity
My dating life being fucked? Well, I suppose I could always take up one of the generous offers I receive:
Email: tom[redacted]@yahoocom
Subject: i want no strings fun
Message: hi zoe im tom i want no strings fun with you i seen you on tv im 30 with brown hair want a SHAG OK MY NUMBA IS 07[redacted] TXT IF CAN N WILL RING U BK WEN DA WIFES NOT AROUND I WOULD LOVE URE TITS IN MY FACE WITH U ON TOP OF ME I LIVE IN [redacted] BUT CAN TRAVEL 2 LONDON 4 SEX OK YOUR LOOKS R WELL WORTH THE JOURNEY BABE NO STRINGS THOUGH YA
'Tom', don't hold your breath: I won't be making contact Not now, or ever Besides the obvious reasons (I never asked to be your 'friend' on Myspace*, fucker), it's safe to say I have a preference for men who don't cheat on their partners and who also never use txt spk: they're the two quickest ways to dry a woman up, I guarantee it (A lack of personal hygiene in the cock area is the third way – but then everyone knows that)Seriously though, when I'm approached with an opportunity

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