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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Jim McMannis who wrote (135163)	3/30/2001 4:55:20 AM
From: Joe NYC	Respond to of 1573930

Jim, Sperm do not survive well at body temperature. Which explains why the testicles reside outside the body. Even birds whose testicles are internal have elaborate cooling apparatus. Interesting idea about the temperature. I have seen or read another theory why human testicles are outside of abdomen. They compared a number of animals whose testicles are inside / outside, and they came to a correlation that the animals that perform activities that involve a lot of strain, especially flexing of abdominal muscles, which produces a strong pressure inside abdomen and pelvis have testicles outside. The reason is to prevent the semen from leaking out when the pressure inside is strong. Apparently there is not really any mechanism or valve (or it is too weak to keep the sperm inside). Only muscles to pump it out when needed. Joe