New Yorkers’ libidos hit hardest:

Only 11 percent of Big Apple residents reported having more than one sex partner in the previous 12 months, according to a report released yesterday.

That left 89 percent in the “faithful” or “not getting any” categories.

And only 5 percent of married couples or those in a relationship reported cheating during the last year. Seven percent of men said they had multiple sex partners, while 3 percent of women reported extra-marital activity.