Male attitudes to sex in pregnancy can be wierd and vary from 'Ooooooh kinky' to 'ugh, no' so I think his reaction is a response to the pregnancy - don't, BTW. think that this is because you are fat and hideous (because you are not, not in his eyes and you should never think that) but rather that he is not feeling sexually charged. If penetration is a problem, maybe suggest some mutual masturbation (no need to go anywhere near the 'baby' for that) with lots of cuddling and things. Let him remember how good sex can be. I agree that getting your relationship issues sorted before thinking about kinky stuff - get that right and the rest should follow.