Well this thread is super old but I just found it and thought I'd answer as well. I'm a girl and I pee in the shower. I wouldn't do it with someone else in there with me, I would never pee while having a bath, and I would try to refrain from doing so in someone else's shower. I dunno, I understand why some people may find it not so sanitary, but I kinda disagree. See, if I'm going to pee just after I get out of the shower, I feel like I am just ruining all the cleanliness I created. Of course I wipe and of course I wash my hands, but to me, peeing in the shower is cleaner than wiping as I get to wash all my parts and I always rinse my shower and lift the bathmat to rinse whether or not I pee in there, so in my mind it's clean. Plus I feel like I'm saving a flush, which of course sounds stupid. But yeah, I'm a female and I pee in the shower. Got a problem with it?
Hehehe.