In a genetic study of 350 lovers, the Eros style was found to be present more often in those bearing the TaqI A1 allele of the DRD2 3′ UTR sequence and the overlapping ANKK1 exon 8. This allele has been proposed to influence a wide range of behaviors, favoring obesity and alcoholism but opposing neuroticism-anxiety and juvenile delinquency.[3] This genetic variation has been hypothesized to cause a reduced amount of pleasure to be obtained from a given action, causing people to indulge more frequently.[4]
Thanks for the link. This part was fascinating: