I'm married and hook up with other married guys as well as some gay men. I usually insist that they use a condom to fuck me, unless I either know their sexual history or they're on PrEP.
I don't understand the premise that because a guy is married, he is somehow safer. If anything, I find the opposite is true. I've watched married men in spas and at sex parties letting a succession of tops bareback them without a care in the world. Being married does not somehow create a shield of invincibility.
Ask a gay man the date he last got tested, or whether he's on any preventative meds and he'll usually tell you. I've asked a few married guys over the years and some didn't even know what PrEP or PEP were.