> Why don't female lesbians display this behaviour?
Try undergoing a transition from a testosterone dominant system to an estrogen dominant system and you will understand. The nature of sexual urges under testosterone is very different from that of estrogen. Arousal under testosterone feels very urgent. I can control myself but imagine an abused 20 year old who never learned healthy self management. Without PrEP their urges may get them killed before they ever learn to control their impulses.
> I am against the prevailing hedonistic culture.
You can be against whatever you want. I am just explaining some facts about the benefits of PrEP for people that think differently from you.