We're talking about rape, right? Right?
Also, in this day and age, if some strange old lady starting talking to my daughter about sex while in a store's dressing room, I'd want to call the cops.
I think she was talking about date rape. Like, the girl is with a creep who's stronger than she is, and there's nobody she can call on to help her get out of the situation.
Under the circumstances, at least oral sex would keep her from getting pregnant, less likely to get an STD, and maybe the creep would fall asleep so she could run away.
Maybe it's not such bad advice. But certainly not invited by the parent and probably not by the girl. And here Sharon Stone is, coming out with another movie where (if I can believe the movie poster) she shows her crotch to the world.