a friend of mines boyfriend likes to wear thongs, lingre, pantyhose, and he likes to do anal with dildos etc. this is all in private, he doesn't do this with her. they both sorta know that each other knows id assume. she doesnt say anything about it though. but what would u call this? and how would this start?

Edit: i dont think he is gay. he doesnt watch gay porn, or anything like that but it maybe some gender identity confusion i think? idk im all ears.