Okay, real answer time.

But we gotta ask more: okay for who?

A dental dam provides (or can provide) protection to both parties.

Since going ass to mouth is inherently high risk, the person performing analingus is going to benefit more from it in that regard.

So, anyone objecting to you using one while eating their ass should be told to eat your ass as you walk out the door.

That being said, dental damns do change the sensation of oral endeavors for the recipient. Same as condoms or gloves, the texture just isn’t the same. Unlike those, using a dental dam takes a bit of skill to make work. So you know, “okay” is likely to be as good as it gets without practice. Goes for eating pussy too.

Me? It’s like being in the mafia; one slip of the tongue, and you’re in deep shit.

Also like the mafia, I ain’t joining in without multiple kinds of protection.

Butt, if you put the time into using them with a partner that’s open to a mutual learning curve, the end result can be very pleasurable, even orgasmic.

The key is to remember that the dam is not great if it’s used the way it is in the mouth in dentistry. It can’t be a static barrier and actually feel good. So you need a decent sized sheet that allows you to move it with your mouth and tongue (again, this applies to both analingus and cunnilingus) without also exposing your mouth to the anus and its immediate surroundings. It also doesn’t do any good if the damn is slipping around so much that it gets twisted, resulting in both sides having contact with the recipient.

So while you’re trying to move the dam to cause stimulation, you also have to keep it fairly limited in how far and how it moves. It’s a learning curve

Also, an instructional video: https://youtu.be/3l2oi-X8P38