It’s made that explicit for a reason – because by being that explicit, teachers are protected from complaint for doing what the law requires, and what accepted practice requires.
Why does a flogging of a woman or the caning or paddling of a schoolgirl seem so controversial? Puritans made concessions to the woman’s body in the days of judicial flogging. In the repressed times of sexuality the target of CP (hands or bottoms) were a concern and later matters like menstruation and pregnancy matter. Menstruation is predictable but not so pregnancy.
From the early twentieth century the abolishment for CP became a focal point in the States but after woman’s right to vote onward and progressively so with woman’s liberation in the seventies.