A “dam” is a moisture barrier made out of latex or polyurethane. Dentists use a “dam” when they work on someone's mouth (so that blood won't splash).  There is one company that makes dams specifically for use during oral sex.  People can use a dental dam during oral sex to prevent sexually transmitted diseases (STDs), including HIV. A dam is a square piece of latex that can be placed over someone's anus (butt hole) or vagina. With a dam, germs cannot get into someone's mouth from blood or sexual fluids found in the anus or vagina.

How to Use a Dental Dam [adapted from www.drcondoms.com ]

1. Like condoms, dams should be handled with care. Check to make sure that the dam does not have holes in it.  To do this you can hold it up to the light or see whether water will pass through.

2. If there is talc (powder) on the dam, rinse it off with water. Talc is usually applied during the manufacturing process, and can irritate the skin.

3. You can use some water-based lubricant (e.g. Astroglide) on the vagina or anus before putting the dam down.  Using a lubricant can increase the sensation for the person receiving oral sex and it can help hold the dental dam in place. Do not use oil-based products such as lotion or baby oil. Oil can weaken the latex.

4. Holding the dental dam firmly with both hands, spread the dam over the vagina or anus (butt hole).

5. Be sure to keep one side toward you and one side toward your partner. Don't forget which side is which.

6. Never use the same dental dam more than once. When finished, throw the dam away.

Dental dams are extremely effective in preventing sexually transmitted diseases.  Dental dams can be found in various colors and flavors.  You can purchase dental dams on-line:

www.sheerglydedams.com

www.justrubbers.com

www.drcondoms.com

www.condom.com

If you don’t have a dam to use during oral sex, you could cut a condom lengthwise and place it flat across the vagina or butt hole.  Even household plastic wrap [like Saran Wrap] can be used.