My boyfriend really wants to do anal with me. It's getting to the point where he is constantly bringing it up. I've tried to do it with him a couple of times because I just want him to shut up about it but it honestly hurts so bad. He keeps telling me that I don't know that it hurts because we haven't tried it properly, and I've told him that if I'm not comfortable and relaxed that it isn't going to work properly. How can I make him understand that I don't want to do it and stop him from bringing it up? He gets annoyed every time we try and it doesn't work and in a way I feel like I'm letting him down.