Lynn here. But the same things apply when I'm getting fucked bareback - and I agree bare does feel better. Check out the statistics where you live - some areas have higher rates of STDs than others. Older guys, esp married men are much lower risk. most of the men we've played with who have enjoyed bisexual play have only been bi when playing with couples in a cuckold situation as part of their bull role or mostly only orally bi but can occasionally be persuaded to go further, rather than young guys on the gay circuit (hubby has had unprotected sex with gay men he knew well but that's another matter and largely in the past now) . You can of course decide that you only want to play with guys who have a recent sexual health certificate. We don't but we do get regularly tested ourselves as we don't want to pass anything on and for our own peace of mind. But there is always a risk with unprotected sex. We've never had any problems and I've had unprotected sex with hundreds of guys, a small number of whom have also had sex with hubby. So I guess we've been very fortunate. But like anything in life you have to decide for yourself what degree of risk you are prepared to take.
Also most of the guys who have had sex with hubby (not including just cock sucking) have been regulars we know and trust.
One of the big ones to avoid is intravenous ...... users as they are a much higher risk group.
Don't know if that helps or not but hopefully gives you a few pointers.
Lynn xx