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Originally Posted by robfantasy
can someone explain to me how this is possible
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Sperm held in the mouth will not be damaged as long as it's protected in its gel-like form. "If you check sperm in the vagina two hours after intercourse then most of them are immobilised," says Dr Brody. "They've lost their gel protection. The vagina is acid and semen is alkaline so maybe that's also why they have this coating."
http://www.guardian.co.uk/health/sto...426590,00.html