Need advice!!!!

Been marryed for. Almost 3 yrs and husband rarely wants to have sex and when he does he wants butt but i feel gay. when we actually does this i think he might be bisexual or bicurious or even gay but dont want to accept it how do i help him he once asked if someone is considered gay if he bangs a guy but not the one being banged. So thats what make me think he might be