Well, that's just incredibly rude and ignorant. Also completely antithetical to my experiences with people who have progressed some distance in higher education.
I'm a PhD and a happy frequenter of a good number of bathhouses, not to mention tea rooms (including more than a few at top-tier schools), highway rest stops, adult bookstores, parks... well, you get the picture. Most of the academics in my personal circle of friends are definitely sex-positive and the group as a whole has, I would say, a higher than average representation of LGBTQ+ people as well as plenty of straight allies who are very far from narrow (including one whose professional academic focus is basically the study of BDSM).