Clarifying/responding to the "regretting it afterwards" thing Cyanara said- lots of women who were raped don't want to admit it to themselves, and only that awful feeling afterwards clues them in to the fact that it was rape. No one wants to believe that they've been raped- it's a defense mechanism. Just like abuse victims say "she/he didn't mean it, it's not like she/he is abusing me, or anything" when their wife or husband hits them, rape victims find ways that it must have been their fault, and try to convince themselves it was just "bad sex". So, yes, regrets afterwards don't necessarily mean rape, but if someone feels violated or seriously upset after a sexual experience, they should take a hard look at what happened, as that *can* be a big red flag that they were raped, and they just haven't been able to admit it to themselves.