My experience with the ladies room is that it's polite to smile and/or say hello while passing someone. Friends usually have conversations while in the stalls. As for the whole modesty thing while using the loo I've never had any teasing problems or anything like that, I mean it is a bodily function, so I don't see why there should be. The mirror check thing is a huge thing for women, anytime I go into a bathroom most of all girls' time is spent checking themselves in the mirror rather than actually using the facilities. lol :]