That is a really new concept on the scene and is becoming very popular.
Some couples just like showing off and love being watched while getting it on.
In fact, you'll find swinger ads from Los Angeles to Boston and Chicago to Phoenix, as well as from Adelaide to Birmingham, England.
The classifieds are posted are by people already using the web for casual sex and enjoying the lifestyle.
There you can instant message, email and chat with others using apps that feature personals for sex.
You'll find postings from nearly 36 million men and women, including BBW and couples with bi and bi-curious wives.
It features chubby couples for swinging as well as Asian, black, Latinos and Hispanics, who are into no strings attatched.