"28.3 percent of women... fantasized about..."
A 2014 study conducted by researchers at the University of Montreal and published in the Journal of Sexual Medicine suggested that 28.3 percent of women and 13.1 percent of men fantasized about having sex with more than one man at the same time, and that 24.7 of women and 75.3 percent of men fantasized about having sex with more than one woman at the same time.
That's a summary from a trashy magazine, but I would wager that most people won't admit their deepest fantasies to researchers. The true number is likely higher.
I write this not to argue that you should indulge in a chick's depraved fantasies, although I do that, but to remind you of who and what you're dealing with beneath the surface. Many if not most chicks will present one way and behave another. Most guys do not realize this immediately... it took me until I was well into my 20s to really get it, although I should have put together the pieces much earlier.
If you're a guy who can execute a chick's deepest fantasies, while also communicating to her that no one else needs to know about what she's done, she may truly be yours.
If you're on a date with a woman, there's at least a one-in-four chance she'd like to try group sex. Most women will not admit that quickly, of course. But they might admit it to a non-judgmental, open guy who they've been sleeping with for a while.
Most guys never get to see how deep it goes (and don't want to know). Even now, I'd bet the majority of you think you know but haven't gone all the way. Even I'm not sure I have.