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Sex is not about reproduction; sex is about re- Spanking at school stories of DNA. Sex, not reproduction, always involves physical contact between two individuals; to achieve this, strategies of sexual behavior evolved. Sexual behavior, therefore, did not evolve as part of a reproductive strategy, but evolved to enable exchange of genetic material. In multicellular organisms the situation is more complicated than in unicellular organisms, as it is impossible for each cell within a multicellular body to have sex with another cell.
Hence, evolution selected a system in which the possibility to have sex was limited to only Groped crowd surfer cell-line: the germ cells.
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As a result, sex adopted the character of fertilization, and sex and reproduction became inseparably linked. Still, in some species, including humans, sexual behavior still exhibits features of its evolutionary past: in humans like in bonobo's most sexual activity and many sexual behavioral patterns have nothing to do with Her first time masterbating masturbation, homosexual behavior, for example ; in humans, sexual behavior also became associated with other strategic objectives, such as intensifying the pair bond, expression of love or power.
Different genders - male and female - evolved, and each gender evolved typical gender-related sexual and reproductive strategies as well. In Role reversal in bed Stud and femme love species, these strategies became inextricably mixed, and sexual behavior increasingly more - and in most species even exclusively - 'served' the interests of reproduction: sexual behavior became more or less synonymous with reproductive behavior.
In most species, the 'mix' of sexual and reproductive strategies evolved into typical gender-related patterns of behavior, that is, Vibrating panties in school typical 'sex-roles'. However, ecological circumstances may cause a reversal of sex-roles, resulting in a situation in which females are bigger and more intensely ornamented than males, females compete for access to males, females court males and only males invest in care for the young, provided they are relatively certain of their paternity.
Sex-role reversal
Also, as in the case of the spotted hyena, females may be highly virilized and be socially dominant. This Futanari erotic stories reversal' is seen, e. It can be argued, with women being the fair sex, exhibiting competitive behavior and with an actively displaying courtship, and with men investing heavily in their offspring, meanwhile taking all cultural kinds of measures to guarantee their paternity, that humans, too, exhibit some degree of sex-role reversal.
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Full text links Cite Display options Display options. Abstract Sex is not about reproduction; sex is about re- combination of DNA. Similar articles An analysis of reproductive behavior in the mouthbreeding cichlid fish, Tilapia macrocephala Bleeker.
PMID: Lherminier P. C R Biol. Epub Mar PMID: French. Reproductive skew and selection on female ornamentation in social species.
Contar historias & conectar gente
Rubenstein DR, et al. Sexual als and mating patterns in Syngnathidae.
Rosenqvist G, Berglund A. Rosenqvist G, Ball worship tumblr al. J Fish Biol. Epub Apr PMID: Review. Sexual conflict and speciation. Parker GA, Partridge L. Parker GA, et al. See all similar articles.
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MeSH terms Animals Actions. Female Actions. Humans Actions. Male Actions. Medicine in Literature Actions. Poetry as Topic Actions. Reproduction Actions. Sexual Behavior, Animal Actions.
Nature pushing borders
Social Dominance Actions. Species Specificity Actions. Copy Download.
