Originally posted by
Saran wrap works much better for me. Dental dams have to be held in place and stretched taut when my hands could be doing so much other, better stuff!. Dental dams are also expensive.
Saran wrap definitely works. Just make sure you don't use the funky special kinds of wrap (like the ones that are microwave safe or those ones that have weird stickiness properties), because a lot of times those create a more permiable barrier than plain old saran wrap. However, saran wrap can rip easily, so it's an issue.
One really nifty thing to do if you don't have a dam around is to make one out of a condom or a glove. to make one out of a condom, just snip off the top and slice up the side (this is most easily done while the condom is still rolled up) and viola!. With a glove, cut off the top 4 fingers and then slice up the side without the thumb on it. This allows a little hole for penetration funtimes.