I don't see any reason why she would bring the topic up at all at this time.
My one thought was that if she's trying to think of things she could possibly be about to do that could be so wrong, well Adrian has form when it comes to inadvertently sleeping with relatives. But then, she's had sex with him before without visitations from the ghosts of Erin past and/or future. In fact, I think she had sex with Adrian
and Jacqui just last night. So I suspect it isn't that.
Maybe they're all just tired...
I bet they've just got this nagging feeling that something more exciting is going on right now where Caitlyn is.