Mr B

If you were not shaved I'd say that's the problem but since you are it is obviously not that.

My guess is that he never liked doing it with anyone but did it anyway when relationships were new because his sexual desire was high. Now that he is married his desire has naturally gone down as it does with most people in long term relationships. So now he doesn't feel the need to do it and since he doesn't like it much anyway (for whatever reason) he doesn't do it.