There was a article in Rolling Stone a couple monthes ago about the Grobski (spelling?) brothers...the guys who made the Matrix movies and have that new movie coming out called V. Anyway, one of those guys was real into S & M and stuff like that and ended up marrying this famous doiminatrix. Before that, the dominatrix was married to some chick that became a man, still had a vagina though, and it was saying she (him, whatever you call it) got bi-weekly testosterone shots to basically turn her into a dude. She is freaking ripped now, I mean huge and looks like a man. Has a shaved head and a goatee, looks like a biker. So yes, I think the answer to your question is trans-genders can get hormones prescribed, even test.