"Casual sex" is an oxymoron. No act that can kill you, maim you, or make you pregnant can be truthfully casual. Of course, with the new meds, an HIV infection is rarely fatal...on the other hand, given the very real dangers of partner violence, mostly inflicted by males, sexual acts regularly lead to stalking and worse. Nobody has taught how to have casual sex in a healthy way because the topic is so difficult to master. I came of age in the late 60s and early 70s, where birth control, Roe, and antibiotics seemed to remove the hazards of what we called "free love". We were young and ignorant, we paid some pretty steep prices;)