Tip for guys - Most womens sexuality is mental, if she feels unattractive she's not going to want to boogy. So if you WANT to boogy with your girlfriend, make sure she knows that you think she's HAWT. You're much more likely to get a little rumpy-pumpy (worked for my ex, and he's not the handsomest guy in the world!).
That being said, implying that you think womens genitals are ugly (which includes girlfriends!) will NOT make her want to be initmate. She'll just feel like crud.
This has been a Kezzstar public service announcement

you just won the whole darn thread. of course not all women are like that, and of course i think many men are like that too, but it's an important key to the OP's reaction and subsequent withdrawal. it's entirely logical.