There are PLENTY of groomers who go after the opposite sex. The data back this up. And remember this guy?
The trap of making this a "gay thing" is that straight child rapists slip through the cracks. The teachers who groom students of the opposite sex to become sex toys are sort of counting on that slip up.
Groomer works because it's accurate, to-the-point, and puts these pools of liquefied human feces into the spotlight.