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Spartacus
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in his book Sperm wars, evolutionary biologist Robin Baker describes wht happens when two (or more) men ejaculate in a fertile woman over a short period of time. Over the course of days, the armies of sperm battle for control of the path to the womb. Of the 300 million sperm unleashed by the average ejaculation, 99.8% are killers or blockers designed to assist an elite team of fertilizer sperm. The blockers keep straggelrs from reaching the egg; the killers poison any sperm produced by another guy. the battle rages even if the armies arrive days apart, although by then most of the first guy's troops have died or weakened enough that its a lopsided battle. studies indicate that because of sperm wars and/or deception, 10% of children born worldwide are not sired by the men who believe they're the father......
