Students in a sexuality class at Northwestern University attended an optional demonstration Feb. 21 featuring a naked woman publicly penetrating herself with a sex toy, according to the Daily Northwestern.
Psychology Prof. John Michael Bailey invited the 622 students from his human sexuality class to the presentation, which included a question and answer period about fetishes, said MSNBC.
Bailey frequently holds educational panels, with guests ranging from swingers to convicted sexual predators, reported the Daily Northwestern.
The addendums do not appear on any exams, said the Daily Northwestern.
"Stick and stones may break your bones, but watching naked people on stage doing pleasurable things will never hurt you," Bailey told the crowd of more than 120 students, according to MSNBC.