How do you use it?

Yes, you've got it You place the dam on the area you intend to lick, etc., and it acts as a barrier. I recommend putting a little lube at least on the side that is touching the receiver, so it will more easily stick where it's placed.

Interesting..

I find that when using it for oral on the lady bits you have to kind of pull the sides a bit and hold it down. That way it's not moving all over the place.