The dating site OKCupid has come up with a list of America's most promiscuous cities:  They looked at the profiles on their site, and which cities had the highest percentage of people seeking "Casual sex" as their preferred type of relationship. 
 
 
Based on that, the most promiscuous city in America is . . . Portland, Oregon.  In second place is another city in the Pacific Northwest:  Seattle, Washington. 
 
 
--Here's the rest of the top ten.
 
 
#3.)  Pittsburgh, Pennsylvania
 
#4.)  Miami, Florida
 
#5.)  San Francisco, California
 
#6.)  Dallas, Texas
 
#7.)  San Bernardino, California
 
#8.)  Denver, Colorado
 
#9.)  San Diego, California
 
#10.)  Houston, Texas