As ever the obvious isn't quite so. I have been looking for answers to the very same question and came across this thread. I found the question to be unanswered entirely so I asked a BSS and gas safe engineer the question. The answer I posted was theirs, in the interest of good spirit and contributing to a knowledge pool on an uncertain discussion, I added it here for any future people who may come across this thread. It was not an 'answer' but information given to me, that had I read it here, I would have found it useful in making my decision about where to install my appliance. I have put it in the kitchen.
Gender is irrelevant.
I can't remember the last time my bathroom filled up with hot steam!