is he trying to hint anal?

Every time I turn around, my boyfriend says "in the butt". Such as "hey babe I want to do you tonight" and he replies "if it's not in the butt, I don't want it". Or even just a few moments ago, I said "I'll put it in my mouth", and he replied again "if it's not in the butt, I don't want it". Everytime he mentions anything about "putting it in the butt", I'll ask if he's serious and he says "noI'm  kidding"....but he says it constantly!!!! Is he hinting butt stuff? Someone who's dealt with this, please tell me what to do or say, because I don't know anymore!