Since ADHD is a disorder of impulsivity, and one of the symptoms of ADHD is being easily bored, wouldn't it make logical sense that people with ADHD are more likely to be unfaithful? And what role do genetics have in a possible predisposition towards cheating?
According to a study by Garcia, et al. (2010), "Associations between Dopamine D4 Receptor Gene Variation with Both Infidelity and Sexual Promiscuity",
Individuals with at least one 7-repeat allele (7R+) report a greater categorical rate of promiscuous sexual behavior (i.e., having ever had a "one-night stand") and report a more than 50% increase in instances of sexual infidelity.
So who has this 7-repeat allele?
Humans that possess at least one allele 7-repeats or longer (7R+) display behavioral phenotypes associated with attention deficit hyperactivity disorder (ADHD), alcoholism, financial risk-taking, disinhibition and impulsivity, and sexual behavior.