How does that work? I know you can use a dam, but that's not much fun. Ladies can suck you off with a condom on if required but how does licking out a lady and safe sex go together?
You can only pick your own safe limits really.
Like you say dental dams aren't fun. Well neither are blow jobs with condoms that much fun.
So you just have to calculate what risks you are comfortable with. Test yourself regularly, ask others about their testing status.
