GOOD DEEDS PAY OFF IN THE SACK

IN a surprising turn of events, nice guys don’t finish last after all — at least when it comes to having sex.

A new paper out of Canada’s Nipissing University examined how selflessness impacts a person’s sex life — and found that altruism typically increases the number of partners one has, as well as the amount of sex one has within a relationship.

For the two studies — which quizzed nearly 1,000 adults on their personality and mating habits — participants first answered a series of questions on how likely they were to help others, such as whether they’ve donated blood or helped a stranger push a car out of a snowbank. They then reported their sexual history.

The results were surprisingly consistent: “The more altruistic you are, the better your sex life,” lead researcher Dr. Steven Arnocky tells The Post. Both men and women who were found to be selfless had more partners and more sex within relationships than others in the studies.

There is a caveat, of course — the studies were self-reported, which means volunteers could exaggerate how kind they really are. “We did anything we could to minimize the potential for bias,” says Arnocky.

Worried your selfishness is holding your sex life back? While some studies have shown altruism can be genetic, others found that selflessness can be learned.

Of course, whether or not altruism for the sake of sex has the same result is up for debate. “If you’re purposely trying to do things for others to get laid, whether or not that’s true altruism . . . that’s more of a philosophical question,” Arnocky says.

Still, he adds: “It never hurts to do nice things for others.”