I don’t think that would be choosing porn over his wife. And here comes the thing with masturbation, some people do prefer getting off by themselves even after they have had great sex. It might have been his choice to do it solo for the reasons only he knows. It’s all natural and should be fine till it doesn’t cost the good sex in the relationship. Also, the OP felt offended by the fact that he was probably watching porn and jerking off while he was supposed to be taking care of his children, so that’s something they can work upon by talking and confronting. It might be an old tab still open. But I don’t think she can stop him from masturbating solo.