Sperm wars video

Remember that '60s refrain, "Make love, not war"? For sperm, some scientists say, love and war are one and the same. According to the so-called kamikaze sperm hypothesis, sperm from different men hanging out in the same vagina may sabotage each other in the run for the egg. New findings, however, cast doubt on this idea. In many species, from fruit flies to humans, females sometimes mate with multiple males in such quick succession that sperm of various appellations find themselves vying for the same prize. That phenomenon has prompted a sexual arms race: Mammals such as chimps have evolved larger testicles to churn out more sperm, for instance, while some insects use part of their reproductive apparatus to scrape out enemy sperm before depositing their own.
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No Evidence for Sperm Wars | Science | AAAS

Sperm Wars is a popular science book by evolutionary biologist Robin Baker about sperm competition. Through a series of short fictional stories and discussion following them, Baker proposes evolutionary functions for sexual habits, mostly on the principle of competition between sperm of different men for a prized egg. The book is controversial, [5] both because of its explanations of homosexuality , sexual assault , and prostitution, and because some critics have claimed that several of the hypotheses in the book are not supported by scientific research. The shape of the penis and the thrusting during intercourse serve to remove other men's semen. Baker also proposes that men adjust the amount of sperm they ejaculate based on the time their mate has spent away from them. This literal sperm warfare was not observed in a subsequent experiment, [15] but Baker criticizes the protocol in this latter experiment.
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No Evidence for Sperm Wars

Enter your mobile number or email address below and we'll send you a link to download the free Kindle App. Then you can start reading Kindle books on your smartphone, tablet, or computer - no Kindle device required. To get the free app, enter your mobile phone number. This classic work on the rules of sex -- updated for a new generation -- is still as provocative as the day it was published, providing simple explanations for any and all questions about what happens in the bedroom.
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DR Robin Baker hopes that anyone who reads his new book on sexual behaviour will never see that intimate "damp patch" in the same way again. That may be, if the image of millions of marauding killer white cells tackling millions of surf boarding sperm in a sea of "smart" cervical mucous is what turns you on. It is more likely, however, that what readers will remember about Sperm Wars Infidelity, Sexual Conflict And Other Bedroom Battles are the inventive new excuses which Baker offers to unfaithful spouses.
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