Justin Garcia, a researcher from SUNY Binghamton took DNA samples from 181 college students and looked at the DRD4 gene and found a variable of a person's D4 gene makes them prone to one-night stands, infidelity and uncommitted sex.
"I know people who have done that, who said my father did it, my uncle did it, and I just couldn't help myself," said Vicki Justice of Ellaville, Ga.
And we heard that excuse over and over again, that this study is just an excuse for someone to cross the line into infidelity.
"It is not an excuse. There is never an excuse for bad behavior in terms of relying on our biology," Garcia said.
Still, even the study says there could be other reasons for a person's penchant for promiscuity.
Maybe they're just jerks.
"Many folks with this gene will never commit infidelity or have a one-night stand, and many folks without this gene will commit lots of infidelity and one-night stands," Garcia said.
...The researchers admitted they need a larger sample size to back up their findings. They said another study is planned.