Monogamy gene discovered.

Gene found that predicts how faithful a dude will be. I'm just glad there's a genetic excuse for why I run to the tv whenever there's a nip-slip. From New Scientist:

They found that variation in a section of the gene called RS3 334 was linked to how men bond with their partners. Men can have none, one or two copies of the RS3 334 section, and the higher the number of copies, the worse men scored on a measure of pair bonding.

Not only that, men with two copies of RS3 334 were more likely to be unmarried than men with one or none, and if they were married, they were twice as likely to have a marital crisis.