I'd bum him first before he gets a chance to bum you.
logic
Just to mix this up a bit for those who think its ok to shower with gay men.
Would you also be OK with transexuals showering with your wives, daughters or your sisters?
I wonder how the OP would cope in many european countries where the changing rooms are mixed. Definitely small willy syndrome here.

I wonder how the OP would cope in many european countries where the changing rooms are mixed. Definitely small willy syndrome here.
Next time the situation arises, while he bends down to tie his shoelaces, slap him in the face with your manly member and shout "NONE FOR YOU!"
problem is, in a changing room its not like your're going to have an erection, and for many men a flacid penis is like tiny then on an erection grows to like 7 inches so yeah i dont really know why i just said that.
