Originally Posted by The Straight Dope

QUESTIONS WE'RE STILL THINKING ABOUT

As a child, I was taught that the point of toothbrushing is to prevent the bacteria in food particles from producing an acidic environment that would cause tooth decay. Later, in sex ed, I learned that semen is alkaline. So what I'm wondering is, does having a little bit of semen in my mouth before I go to sleep also prevent tooth decay? It's more fun than using a toothbrush. --Creative Hygiene in Santa Barbara, CA

Frankly I don't have the faintest idea, C. But please don't let that stop you from spreading this theory around.

--CECIL ADAMS