It's in your genes, dude.
A team led by Hasse Walum of the Karolinska Institute in Stockholm, Sweden, sequenced the AVPR1a gene in about 500 pairs of adult same-sex Swedish twins, all of them married or cohabiting for at least 5 years, and their partners. One variation of the gene was particularly common; about 40% of males had either one or two copies of a version--or allele--of the gene known as "334."
Although not simply an analog to the polymorphism found in prairie voles, allele 334 seems to have a similar effect on the stability of human relationships, as measured in interviews and questionnaires. The tests included a Partner Bonding Scale containing items that reflect affection and cooperation, such as "How often do you kiss your mate?" and "How often are you and your partner involved in common interests outside the family?"
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