You’re not a bad person; you were just born this way.

A new study suggests that your genetic makeup might dictate how down you are with one-night stands, casual sex and cheating on your significant other. That doesn’t mean you should run out and start flirting with everything in sight, but it might be a decent excuse to keep handy the next time you run into that girl from the bar you conveniently “forgot to call back.”

According to Justin Garcia, a researcher at Binghamton University in New York, the primary biological motivator in your never-ending quest for easy play is the dopamine receptor D4 polymorphism, also known as the DRD4 gene. Other studies have already linked the gene to sensation-seeking behavior like gambling and drug use.

Garcia and his team examined 181 young adults, compiled their sexual histories and took samples of their DNA. The investigators observed that there was a distinct genetic variation in those subjects who claimed to have engaged frequently in uncommitted sex.

"What we found was that individuals with a certain variant of the DRD4 gene were more likely to have a history of uncommitted sex, including one-night stands and acts of infidelity," Garcia told "The motivation seems to stem from a system of pleasure and reward, which is where the release of dopamine comes in. In cases of uncommitted sex, the risks are high, the rewards substantial and the motivation variable – all elements that ensure a dopamine ‘rush.’"

However, the research is far from over. Garcia and his team are hoping to run a more extensive study examining a larger group of subjects to confirm the results of their initial investigation.