“To get inside a lubricated vagina, a penis needs to be hard enough to push against the opening with one to two pounds of force. That is approximately the amount of force required to open a swinging kitchen door.” – Mary Roach in BONK
Science pursues sex because, after all, it’s what makes the world turn.
Read more:
http://www.amazon.com/exec/obidos/ASIN/0393334791/theelectype-20
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