First year girls could not sign up for this elective. It was reserved for third years. And it was, by far, the most popular last year class for sissies at the Vera Wang Institute for Male Modification, a/k/a "Sissy School." There was only enough room for a few girls, and auditions were required before admittance. None of the sissies who were accepted ever revealed what they'd done during their auditions to be accepted.
But you can imagine the rumors.