Well, if they pee into a vacuum, mightn't that help, um, move things along, too? Not that I'm anxious to find out, because the experience is unpleasant enough without needing that kind of extra help.
On the other note, I'd send Britney Spears to space. And some of those super-skinny actresses (can you send two actresses/models for the price of one if they both weigh half as much as a normal woman?).