This could be VERY useful if you're single . . . and you have an immune system that can fight a potential onslaught of sexually transmitted diseases.  We've got brand new rankings here of the 10 most PROMISCUOUS cities in the country.

--A survey asked people how many sexual partners they've had.  Anyone who reported more than SEVEN got branded as promiscuous.  And the cities with the highest concentrations of those people made this list.

--Here's the top 10 . . . which has some cities you'd expect and a few surprises . . .

#1.)  Chicago, Illinois.

#2.)  Birmingham, Alabama.

#3.)  Las Vegas, Nevada.

#4.)  Oklahoma City, Oklahoma.

#5.)  Atlanta, Georgia.

#6.)  Phoenix, Arizona.

#7.)  Philadelphia, Pennsylvania.

#8.)  Hoboken, New Jersey.

#9.)  Richmond, Virginia.

#10.)  Hartford, Connecticut.

--The LEAST promiscuous cities in the country?  Believe it or not, the bottom two are New York City and San Francisco.