researchers at Binghamton University, State University of New York (SUNY) have discovered that about half of all people have a gene that makes them more vulnerable to promiscuity and cheating.

Those with a certain variant of the dopamine receptor D4 polymorphism -- or DRD4 gene -- "were more likely to have a history of uncommitted sex, including one-night stands and acts of infidelity," according to lead investigator Justin Garcia.

DRD4 is the "thrill-seeking" gene, also responsible for alcohol and gambling addictions. The gene can influence the brain's chemistry and subsequently, an individual's behavior.