I know exactly how you feel. I used to worry about the same thing with my boyfriend. But if you keep him satisfied the best ways you can it should be ok. He can do anal on you and you can do oral on him. That's what I do with my boyfriend and he's perfectly happy with those options. If someone really cares about you sex is a bonus, not an absolute necessity. Your fiancée knew from the start you have boy parts and I really doubt it bothers him to see them. Actually my boyfriend has never seen mine but at this point it's my hangup, not his. Since I can't tuck the way I normally do when I have anal sex I tape everything beforehand so nothing can be seen. But I get a rash down there sometimes. My boyfriend told me I didn't have to do it and that it wouldn't bother him if he saw it, he would still love me. But I can't do it so I still tape for anal sex but that's my hangup, not his. I'm sure your fiancée loves you for you, not what is between your legs.