Sincerely,For generations, biologists had assumed females to be naturally chaste,
while males were renowned for their promiscuity. Now, hundreds of studies
and a spate of books are challenging that conventional wisdom.
Females of many species have evolved strategies for passing on their genes
that involve copulating with multiple males. Males, in turn, have adapted
ways to ensure that their genes, and not those of competitors, are passed
on. Understanding this co-evolution is changing our view of male and female
sex roles.
Read More: Recent evolutionary research challenges notion of Female Monogamy
The early bird might get the worm, but the last in line makes the baby. From bonobo chimpanzees to fruit flies, many female animals mate with multiple partners that often queue up for the event. Studies have shown that the the last male to mate with a female is the most successful at impregnating her.
The last male can take advantage of a more 'sperm-friendly' environment created by males that have copulated before him, according to a new model put forth by David Hosken and David Hodgson of the University of Exeter in the United Kingdom.
Read More: Evolution and Group Sex: Successful Sex Strategy to be Last in Line
A very interesting essay from the journal of Evolutionary Psychology on sperm competition and its role in shaping the human penis, (size, length, width, forceful ejaculation), evolutionary strategies for successful fertilization i.e. semen displacement and coagulation. On sexual intercourse and evolutionary benefits of deep penis thrusting, function of the foreskin and effects of circumcision, premature ejaculation, female reproductive strategies i.e. copulation with multiple partners, human sexual behaviour and wife rape (males having sex with their partner if suspecting them of infidelity).
From the essay: 'For semen displacement to be adaptive it presupposes situations in which human females have sex with multiple (two or more) males in fairly close succession/temporal proximity to one another.'
Read More: Evolution, Human Reproduction & Fertilization: Sperm Competition, Semen Displacement & Penis
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Analyse
any human emotion, no matter how far it may be removed from the sphere of
sex, and you are sure to discover somewhere the primal impulse, to which
life owes its perpetuation. ... The primitive stages can always be re-established;
the primitive mind is, in the fullest meaning of the word, imperishable.
... Mans most disagreeable habits and idiosyncrasies, his deceit, his cowardice,
his lack of reverence, are engendered by his incomplete adjustment to a
complicated civilisation. It is the result of the conflict between our instincts
and our culture. (Sigmund Freud)
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