Not OP, and generally don't agree with their point, but this passes the general sanity test.

Considering PREP is targeted almost exclusively to gay men, and HIV is mostly a concern among the sexually active gay male population, saying "young, gay, men" is pretty fitting.

Obviously the value-judgement about how much sex is too much or too risky can't have data to back this up. To me, as long as there is a net reduction in risky behavior that might impact society (not spreading a disease faster than eradicating it), its probably good, but this doesn't seem to be OP's view.