What is the correct way to use a dental dam?

What is the correct way to use a dental dam?

Lay it so that one side is flat against the vagina or anus before performing oral sex and hold it in place. That’s pretty much it. You can put water or silicone based lubricant on one or both sides. Either the giver or the receiver can hold it. When you’re done, try to fold it up so you don’t touch the side that was in contact with the vagina or anus. If you do, wash your hands.

Recommendations: Flavored dental dams (you can get them unflavored too), a guide to hot safer sex, and lube.