Yeah!  A Top Ten that doesn't include us!  A recent survey from OKCupid named Portland, Oregon the nation's sluttiest city when it comes to casual sex, with Seattle, Washington, Denver, Colorado and Pittsburgh, Pennsylvania also among the country's top ten most promiscuous cities. The results were generated by tallying the users who list "Casual Sex" among the types of relationships they seek on the site.

The top 10:

Portland, OR
Seattle, WA
Pittsburgh, PA
Miami, FL
San Francisco, CA
Dallas, TX
San Bernardino, CA
Denver, CO
San Diego, CA
Houston, TX