They say what if the teacher was male and student female...
But the thing is- that's totally different story. As it's very hard to "rape" a teenage boy. His hormones, all his body just wants to fu** somebody, dometimes it doesn't even matter if a woman is attractive or not.
The thing is- the guy would not even fell like raped (at least, the most of guys) They would feel like the luckiest bastards on Earth and would immediately tell their friends how they banged the hot housewife.
It's totally different story than it would be if the teacher was male and student female.