Sparks_Advice

I can understand the worry that you're going through right now. The gist of the situation is he is engaging in behaviors that are unacceptable to you, and he is refusing to change. It shows that he is unwilling to listen to you and unwilling to work on the relationship. It's a very difficult spot. Your three main questions were about sex, curiosity, and not making him defensive. But those things are only going to get resolved when he decides that he is willing to listen to you and work on the relationship.