It won't stain anything - ask any guy, guys pee in the shower all the time.
No, it won't stain. I'm a girl and favour standing, but I guess you can squat too.
O and you don't think most girls pee in the shower too.... get real man, some just won't fess up to it when asked but 4 out of my last 4 girlfriends peed just about every time we showered together. Whats the big deal? Its all just mostly water anyway.
Everybody pisses in the shower.
No, it will not stain. You can use any position you want to, to pee in the shower. Peeing in the shower is great.
Try bringing a friend along and pee on each other.
