How interesting this thread is!
I don't have a massive bump yet (but a pretty generous sized tummy, LOL!) and DH does occasionally give my belly a rub. TBH, I don't like it overly much! I am not as tactile a person as DH and after having been married this long he's pretty aware of it. So once bubs is bigger and can be felt from the outside I will tell DH so he can feel it too, but apart from that, I really don't care if he touches me or not!