According to The Daily Northwestern, around 120 students from the 600-strong Human Sexuality class attended the optional after-class presentation on February 21, which featured a woman being penetrated and stimulated with a device referred to as a "f**ksaw".
Audio obtained by the newspaper revealed psychology professor John Michael Bailey stating to applause: "Sticks and stones may break your bones, but watching naked people on stage doing pleasurable things will never hurt you."
In a later statement, Bailey explained that Chicago sex toy guide Ken Melvoin-Berg had asked him "whether it would be okay if one of the women with him demonstrated female ejaculation using equipment they had brought with them".
He added: "I hesitated only briefly before saying 'yes'. My hesitation concerned the likelihood that many people would find this inappropriate.
"My decision to say 'yes' reflected my inability to come up with a legitimate reason why students should not be able to watch such a demonstration. Sexual diversity is surely a reasonable thing to address in a human sexuality class."
Sexual health education and violence prevention co-ordinator at University Health Services Laura Anne Stuart said: "As a sexuality educator, I do think that demonstrations of specific arousal techniques - those definitely have educational value."