That's not true. Specifically, I know that there has been a big push to get more men involved in education. The motivation for this is that young boys (and even teenage boys) who are behaviorally disruptive in class respond very well to a male teacher. And that's a win for everyone. Unfortunately, teachers are not well-payed, so it's hard to get people into the field, period, let alone men.
Indeed I suspect there is some outward pressure (socialogically, biologically, what's in the balance?). But is also there also a greater liability for, at least in terms of the current progression of student vs teacher rights, harassment or sexual assault?
-Tez