The silent majority are exactly that, silent. And in this case, girls who had low status in their families to begin with have less than zero incentive to indulge their kink by recalling painful memories that they have spent a lifetime forgetting. At that age, EVERYONE seemed to abuse them, siblings, family, teachers, bosses, friends. For most of them, moderate spankings from their teachers probably came low down on their list of nasty things to be endured until they got old enough to make their own lives.
I remember female members of my own family at that period, and they just wanted to be able to make their own choices, no matter how foolish. Therefore they clashed with everyone around them, all of the time. Now at that age, girls aren’t sexually naive, and they’d suspect that the spanking teacher was getting his ‘freak’ on, but then again, they’d be aware that most males had a sexual interest in them of some kind.