Devil's advocate: Prove a grope occurred. It's a light, soft-tissue touch. A slap is a violent strike with an open palm, and a punch is a violent strike with a closed fist.

>A slap is a violent strike with an open palm, and a punch is a violent strike with a closed fist.

A slap from a 110 pound woman (just a hypothetical weight) is not equal to a punch from a 160 pound man.

A punch from the man can easily cause lasting harm--broken nose, broken jaw--an open-handed slap across the cheek from the woman cannot (barring some crazy edge case).

>Prove a grope occurred.

She's not going to have to. The cop who arrests you is going to believe the crying bleeding woman over the man with barley a scratch on him--and eventually the prosecutor and the jury will too.

It's best just not to punch someone much physically weaker than you are unless you actually fear for your safety, e.g., she's holding a knife.