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Comedian Kevin Hart issued a public apology to his pregnant wife, Eniko Parrish, and his kids after a leaked video captured a man that looks like Hart cheating with another woman. The 38 year old, who's been candid about cheating in his first marriage with Torrei Hart, took to Instagram to apologize for his "mistakes" and revealed he was being extorted for money. Hart's history of cheating poses the question: "Is it normal to be with just one person?"

In one episode of Chelsea Handler's Netflix show, Chelsea, Hart spoke about his past with infidelity, saying, "I got married at the age of 22. I was still all over the place. I didn’t really understand the definition of marriage. I wasn’t ready for it, so I take responsibility."

The comedian later added, “At the same time, that was when I was in the prime of my sexy, so don’t blame me. That’s when I was figuring it out.”

In the animal kingdom, only 3 to 5 percent of 5,000 mammal species, including humans, are known to be sexually monogamous with their partners. From an evolutionary perspective, it's advantageous for men to have sex with several partners in order to spread their genes around. But for women, the advantage is in remaining with a single partner who will stay and help her raise her children.

Although "spreading your seed" is not an excuse to cheat, natural selection tends to favor promiscuity, according to R. Robin Baker and Mark A. Bellis, authors of the book Human Sperm Competition. Baker and Mellis propose that the more promiscuous someone is, the more likely their genes are to survive. In other words, cheating on a partner increases the chances of passing on genes.

And, like many aspects of our biology, his surroundings may have triggered certain features to emerge. He says, "I put myself in a bad environment where only bad things can happen and they did."

The drama also lends credence to the anecdotal belief that "once a cheater, always a cheater." As it turns out, there's some evidence to back up that claim, too.

A recent study published in the Archives of Sexual Behavior found unmarried couples who've previously engaged in "extra-dyadic sexual involvement" (ESI), or having sex with someone other than a partner, were three times as likely to report cheating again in another relationship. Those who have been cheated on in the past were more likely to be cheated on again in their next relationships.

Although Hart confesses, “At the end of the day man, I just simply have got to do better," he could just simply be a serial cheater who's not meant to be monogamous—you know, according to science.