A dental dam is a small piece of latex used as a barrier during oral sex. Although oral sex does not present the risk of pregnancy, a dental dam works much like a condom to prevent the transmission of sexually transmitted infections like HPV.
More About Dental Dam
Dental dams got their name because they were originally used in dental procedures. They are easy to use for oral sex and come in a variety of sizes and flavors. Because they are made from latex like most condoms, water-based lube must be used and they should be discarded after each use.
Using a dental dam does not ruin oral sex. The feeling of latex with lube can be just as enjoyable as a tongue.
You can also make a dam out of a condom by cutting off the tip and cutting it down the side lengthwise.