LOL! Thankfully she had no idea why 
Yeah I’ve had a few of these, but just without the sex, if that makes any sense.
It was just dreaming about afterwards and the consequences, dream knowledge that at some point in the past I had done these things (incest, necrophilia), I never actually dreamed the experience itself thankfully.
Also there have been occaisions in NDs and semi-LDs where I’ve ahd somewhat sexual experiences with the kinds of people I wouldn’t expect to be attracted to in waking life, like fat women (I’m a gay guy and generally not attracted to fat people at all). Most of them have been kindof enjoyable at the time though, if a bit surprising upon waking up.
There was one other incident in a semi-LD which I would rather forget. All I will say on the matter is that it was a bad idea to think that I could change a DC into someone more acceptable after I started having sex with them.