I don't think there are any concrete rules, which is why the sensible thing to do, if you're in a position of power, is simply not chase any members of the oppo

I don't think there are any concrete rules, which is why the sensible thing to do, if you're in a position of power, is simply not chase any members of the opposite gender that you have a compromising interest in. It's not as if there aren't plenty of other dating prospects out there.