Just over a third of adults in New York City used a condom the last time they had sex, despite millions spent by the city in promoting safe sex, a new survey revealed.

The survey conducted by a city Health Department has found that despite the city spending millions of dollars buying, marketing and distributing free condoms to promote safe sex, two-thirds of adults said they didn't use a condom the last time they were in the sack, the New York Post reported.

It was found that around 771,000 New Yorkers had two or more sexual partners last year, out of which 457,000 boasted having three or more partners.