This is me demonstrating the elasticity of a dental dam at the 1992 Philadelphia gay pride festival. A dental dam a a latex square that you put over a person's anus or vulva if you want to lick them there and you want to prevent transmission of diseases.
BiUnity, a organization for bisexuals, was running a dental dam kissing booth; we sold kisses through dental dams for $1. For some reason, many people at the festival found this shocking.
The two entangled women on my right are Jaye Fox and Lorrie Kim, demonstrating how it's done.