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Filtering water is probably unnecessary...
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 (January 26, 2010 at 1:09 am)Eilonnwy Wrote: If a woman has sex with a man really soon after having sex with another man, the sperm will do battle. In chimpanzees, semen from one male forms a plug on inside of the female so that other males can't impregnate her. This in turn selects for stickiness. Ducks have corkscrew penises and the females can choose to use a specific load of sperm from any of the males she mates with. |
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