oh man, you only have to fall in once and have your booty scrape the bowl before you turn into a complete cunt about the toilet. But thats something that happens to noobs. As had said, it is actually meta to leave the seat up when housed with a bunch of guys. The woman is the one effected by the toilet seat, so she's the one who needs to be the responsible party.

Never touch the seat except to lower it. Once they understand that, a house full of girls will always keep it in the upright position, even if there is only 1 guy in the place. It has to do with targeting. The bigger the target, the less urine you're going to sit in.

You guys don't have your own urinal at home...?