Here’s an idea. When you make a decision to do something stupid, you have to weigh the consequences. For instance, if you have sex with a stranger, you might get an STD or AIDS or crabs or a baby or get accused of rape. It’s the price you pay for being an idiot. Think of child support when you nailed a stranger as a Stupid Tax.
So propositioning a (possibly underage) girl just might get you arrested. That fine is your Stupid Tax
Appy, I wasn’t endorsing that guy’s behavior. I think it is boorish. You cite several possible consequences, all of which are plausible, except for the last one: getting arrested. My original question was about where the line is: whether it was the proposition or the putting hands on a (non-sexual) area of the body that made this an attack or assault. I think the physical contact is a reasonable dividing line between mere boorishness and criminality. Your position seems to be that merely asking an unwelcome question (one time) justifies arrest. Suppose the question wasn’t about sex but about, say, buying some product I am trying to sell. Would it still be an arrest-worthy action?