Public health education means getting gay men to start wearing condoms or dental dams and apparently that's a bridge too far for them.

The total refusal for anyone at scale pretty much anywhere to use dental dams is particularly egregious:

https://www.theatlantic.com/health/archive/2019/04/dental-da...

https://slate.com/human-interest/2021/08/no-condoms-gay-sex-...

https://www.washington.edu/news/2024/02/27/qa-decline-in-con...

https://www.huffingtonpost.co.uk/entry/prep-condoms-gay-sexu...

At least a portion of the amount of people "in the closet" are closeted for fear of STDs, not particularly because of social stigma risk.