Yeah, that's only a punishment until he actually tries to have sex with them and realizes he has no way to get through all of them in two hours unless he has the stamina of a god.
Unless the punishment is literally just him beating the shit out of them I guess, but why bother transforming them then?
I think the setup would have been better served with the initial line its a punishment for sexual offenders, so that he reports them for rape, and meets them in prison after being genderbent by the government and rapes them back.
which might be an interesting story. man rapes woman, govenment reverses both of their genders so former woman can rape former man back