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Thought this might interest folks here.
PLoS ONE: Associations between Dopamine D4 Receptor Gene Variation with Both Infidelity and Sexual Promiscuity
We administered an anonymous survey on personal history of sexual behavior and intimate relationships to 181 young adults. We also collected buccal wash samples and genotyped the DRD4 VNTR. Here we show that 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.
PLoS ONE: Associations between Dopamine D4 Receptor Gene Variation with Both Infidelity and Sexual Promiscuity