If you’re a white guy dating a white girl, or about to marry one, she’s probably not going to tell you all about her sexual past. She’ll probably leave some things out. And if you press her on it, she’ll probably just lie to you.
She’s probably not going to tell you that she went through a black cock phase in college. Or about that time on Spring Break when she fucked those three black guys from Baltimore, and they all wanted anal. Or that she still occasionally secretly hooks up with her old boyfriend Jamal because… even though he wasn’t husband material… he knows how to fuck her the way she likes.
Sometime down the road you might find out her little secrets. Or you might not.