I asked a friend of mine if, in his experience, women mind if that should happen. He said, "mind? Seriously? Why would a girl be dancing and grinding her ass into my crotch if she minded that something happened?"
And he's a man-whore. He's danced with a lot of ladies at clubs. If they're already dancing with you, and you salute them, a good 99% consider it job well done on their part. Why else would they be dancing and grinding their bodies
on your crotch?