You shouldn’t worry so much. Im mostly a Guy? and from what i’ve heard about us= that we are pretty much all brain dead "hehe". Honestly more then likely he won’t even know the difference unless you tell him. I do advocate telling him but i wouldn’t worry to much about it. Keep it simple and let him know that your feeling uncomfortable about what you are feeling. I’ve had several discussions with girlfriends over the years. Regarding myself as im not exactly normal. And i’ve gone threw alot of hangups trying to explain that im different. It was alot harder when i was younger, i didnt find out how different i was untill i was 22. 10 years later im still confused at times but am finding it alot easier to talk to people. I’m not even positive i have CAH, actually seems more likely that im CLAH with everything that i have and the surgeries that i’ve had. With what little info my parents have told me i know im different then most people. Ill leave it at that. Let your boyfriend know your uncomfortable and maybe even why. But as far as whats down there im sure that he really wont mind. you could refer him to this sight and give him some info if you feel up to  it. But overall im sure he’d be happy with you just the way you are.  take care.