How does it feel if you for example accidentally touch someone sexually at a party? Am I in trouble?

If for example I'm standing for example next to a girl at a party with loud music and accidentally touch her breast with my upper arm, am I in trouble? How would she feel?<br>I once had a similar situation where a girl grabbed my crotch in the middle of the party and smiled mischievously. No one paid attention to it. I was just freaking out about it. She was very drunk.<br>I'm just wondering in general how you would react if someone accidentally touched you sexually at a party.