IR breeding and evolution

SWM4bbcslut

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"In his book Sperm Wars, biologist Robin Baker speculated that the excitement and stimulation of the cuckolding fetish emerges from the biology of sexuality and the effects of sexual arousal on the brain, although it is important to note the word "cuckold" does not appear in his book. According to one of his theories, Baker believes that when a man thinks that his female mate may have been sexual with another man, the man is prompted by biological urges to copulate with the female in an effort to "compete" with the other man's sperm. Baker is also one of the few proponents of the theory of Killer Sperm, the idea that sperm compete not only for first access to the egg but by "attacking" other sperm. Although this idea appears frequently in cuckold fetish material, very few biologists share this view....
The cuckold’s urge to thrust, through intercourse or masturbation, is often enhanced by the presence of the bull, whether real or fantasized. A study by Gordon Gallup and coworkers (2003) concluded that one evolutionary purpose of the thrusting motion characteristic of intense intercourse is for the penis to “up suck” another man’s semen before depositing its own." https://en.wikipedia.org/wiki/Cuckold

"A study last year, published in Evolutionary Psychological Science, revealed that a couple's best chances of getting pregnant may be when they've just met. Researchers found that men turned on by a new sexual partner produced more and better quality sperm than when they had got used to sleeping with that woman."
Read more: http://www.dailymail.co.uk/femail/article-3538519/Why-far-likely-pregnant-one-night-stand-Archbishop-Canterbury-s-mom-proves.html#ixzz4aPeWxsXN
 
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