Furey

I teach Sex Ed. - most STIs are asymptomatic most of the time, especially for those assigned male at birth. HPV for example can lead to cervical cancer and dude would never know he had it. So, do with that what you will but by his response alone I'd assume he isn't wearing them as often as he can get away with it and you can hope all his sexual partners get tested regularly or you can be safe and protect your safety over his comfort.

Rereading "A Deadly Education" by Naomi Novik so I can finally get around to reading the rest of the Scholomance series.