Most of the ones who "can't" turn out to manage it afterall, if the social setting and power-dynamics is such that it's clear they won't get away with it.
They somehow manage to hold back the urge to lick the neck of the HR-woman interviewing them for a new job. They somehow manage to keep their hands *off* the ass of the police-woman stopping them in traffic. By some miracolous application of will, they tend to refrain from referring to unknown women as "baby" if a sufficiently large male stands by their side.
This tells me 99% of them *can* behave, they just don't think it's needed.