So you think a girl saying yes at any time should give a guy free reign to do whatever he wants for any amount of time?
I think basically what dazzleman was trying to say is that, if a woman is able to decide she doesn't want sex anymore after penetration has occurred, and if it's considered rape the moment after the woman has decided that she doesn't want sex, then unless the guy is able to teleport out of the female the instant that she decides she doesn't want sex, he's essentially accidentally raping her, and could be charged as such, which is obviously not what such a law is intended to do. All he's saying is that there needs to be some consideration for the man, instead of making women able to turn men into rapists in the eyes of the law purely through revoking their consent to sex, and I would agree with him.
Regarding the issue at hand where the guy grabbed the child by the arm, I think that the correct response would be to ask "why the hell is restraining a minor a sex offense", and then change it. No need to inflame the situation by pointing at a large group of people and randomly blaming them for it.