If ya beating it right and her body is into you, somehow your scent, blends with her scent and that creates a lil scent that is always there no matter how clean she is.
That’s no scientific statement and the only evidence I have is the multiple times it’s happened with me and I’ve become aware of it. So I just assumed I’m no one special and it happens with everyone. So I’m just sharing in case you didn’t know that it is a thing.