So then, Cunnilingus isn't just an Irish airline.

In general it would appear that most people seem to think that oral sex is safe (or at the very least, significantly safer) sex. But, STIs can also be transmitted orally. My question today is, have you ever used a dental dam or other such method when going down on a woman?

I'm trying to establish how common a practice this is. Personally, I can't ever recall hearing anyone (whether giver or recipient) mention this. If yes, have you ever suggested it and been met with a negative reaction?