I prefer to think girls don't poop. Or fart. Like dlishsguy, I prefer to live in a fantasy land
I never fart in front of women, and I pray to God that one never farts in front of me. Well, I won't really care when I'm married or in a serious relationship, but right now I don't think I could take it.
My roommate and I always shit with the doors open and usually carry on conversations whilst pooping, but I don't think I could ever do that with a girl. I always hold it in until all females leave my apartment before I shit. And if for some reason I can't hold it, that door will be shut and locked.