This is what happens when you have porn readily available. I'm sure he's seen quite a bit. Most people involved in that style of porn look *very* woman like, only they're not.
Don't worry though, he'll never find that in real life. It will be something out of a horror movie.
Now if he makes plans for Rio De Janeiro, then you have something to worry about!
I had a friend who struggled with this after randomly running into it one day. His gf sounded quite like yourself.
Good luck