Some lame astronaut who never even made it to the moon cam in and talked to a bunch of freshman science classes, including mine. He said before we ask questions, he would answer the 3 most common: Astronaut food, space potty and moon sex. The food really does come in tubes with the consistency of a meal put through a blender. The toilet is just tubes hooked up to your spacewee and as far as he/NASA knows, no American astronaut has ever had sex in space. He couldn't speak on behalf of the Russians though. There wasn't a single elevated hand in the room afterwards.