| | Re: Sexual Immaturity?
I think you're seeing a lack of responses because this board is heavily populated by high sex drive people and many of them like to make sex jokes. I'll confess I'm one of them.
The reality of the situation is that there are people who don't like the jokes. Some of my wife's friends would be very uncomfortable for me to make any kind of sexual joke and I don't around them. By your description it sound like he can't see that line.
As Gaia suggested, the important part is to open communication. My guess? He's frustrated about something sexual and it's grown to a resentment. This is his way of lashing back about the resentment. But that's only a guess, the hard part will be to get him to open up to you.
I will offer a bit of advice on getting him to open up: Men don't like to open up to begin with. If he starts telling you how he feels and you get upset / angry, he's not going to be willing to share more. It's not going to be easy because this is a touchy area in a relationship. Just listen, and think about what he says before you react.