If that's your plan, Lotsafun, even if he doesn't want you , you could end up with a queue!
Seriously though, this sounds to me like it is not about sex - this is about the basis of your relationship. You really do need some help to get to what this is really about. Have you asked him what he wants really out of the relationship - he is clearly doing a lot of the things many women would be delighted to see in terms of taking some responsibility for his family, but why is he holding back from you? Time for a real talk, hard though it may be - you cannot continue, if it is upsetting you so much, without doing something.