They may be not perfect, but condoms are currently the only way to stem the tide. Once older couples are in a monogamous relationship, they can have a joint sexual health screening at a genitourinary clinic and if the results are clear they can ditch the condoms, because an infection can only be contracted if there is one present.
I won't indulge myself in my own personal problems with the Mass, how the language sounds to my ear a lot like lines Christopher Lee should be spouting whilst dancing around a windswept island in The Wicker Man ('It is right to give Him thanks and praise'), because I'll probably come across exactly as I am. A man who vehemently railed against his indoctrinal upbringing mid-teens when he realised his homosexuality made him, in the Dr Eckleburg eyes of the church, a sinner.
Up until the age of 40 (2002) I was a responsible gay man. I ensured that I used protection every time I had a casual sexual encounter. I was not in a committed relationship at that stage, so it was not even an option for me to bareback with someone. I found that exceptionally scary at the time, as I was aware of how easy it was to contract STDs, especially HIV.
Efforts to persuade teenagers to have safe sex and to use health-screening services seem to be having a positive effect. Looks like that bloke who said "education, education, education" might have gotten something right after all. So, if you have a teenager, here's ten things you need to know before they become sexually active.