The Glade 4.0

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"Aaaah! Emotions are weird!" - Amdee
"... Mirrorshades prevent the forces of normalcy from realizing that one is crazed and possibly dangerous. They are the symbol of the sun-staring visionary, the biker, the rocker, the policeman, and similar outlaws." - Bruce Sterling, preface to Mirrorshades

"Why do all my attempts at science end with me being punched by Batman?"

Actually, I thought it was the other way around? Thought I read something somewhere that men are at their sexual peak for the day between 7-9am and women were in the evening.
*off to start a poll*

I like Kaffis' theory. Makes sense that women would all have babies together so they could help each other, especially with something as important as nursing because that was the infant's sole source of food for at least the first year of their life sometimes longer.

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"Therefore do not worry about tomorrow, for tomorrow will worry about itself. Each day has enough trouble of its own." Jesus of Nazareth

Science!

There's really not a purpose, it's just a consequence of how erections work. An erection is actually the natural, relaxed state of a penis. The only reason we don't walk around with a permanent hard-on (well, some of us anyway ... ) is that we have a series of muscles that can clamp down and partially restrict the blood flow. Like every other muscle, these muscles tend to relax during sleep.

On a related note, priapism is pretty much the complete opposite of this. At first, everything is normal: muscles relax, blood flows in, erection commences, hilarity ensues. But then instead of either staying relaxed or going back to a partially constricted state, they clamp down completely, cutting off all blood circulation. Since the blood already in the penis can't get out, an erection is maintained. But since blood can't get in, either, this is Very Bad Thing. They're not screwing around when they say to "seek immediate medical attention if you have an erection lasting longer than 4 hours..."

The More You Know(TM)

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Sail forth! steer for the deep waters only!
Reckless, O soul, exploring, I with thee, and thou with me;
For we are bound where mariner has not yet dared to go,
And we will risk the ship, ourselves and all.