That’s not even close to what I was getting at. If you are interested in someone there are a million non threatening, non aggressive ways to signal it. If it’s purely sexual the same applies. If the other person wants the same they will make it obvious.
In the context of the story about the man forcibly putting the woman’s hand on his crotch, there didn’t seem to be any precedent (from the story that was published) that would have indicated that she would want to touch him like that. If there was some conversation that happened where mutual interest was expressed and the conversation turned sexual, then if she wanted to touch him she would.
Grabbing another person and forcing their hand to your genitals is not okay. I don’t understand how that is ambiguous.