Girl's Behavior

Girls, why would you grind against a guy at a concert?

Little background, I was at a concert, and this girl was grinding on me. By grinding I mean, dancing and rubbing her butt against me, as I am behind. I was passive, she was several years younger than me (if she was even 18).

Generally, would you grind on a guy giving him clear signals that this as an invitation, or do you just not care?
It is an invitation
I just don't care
Select gender and age to cast your vote:
Girls, why would you grind against a guy at a concert?
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