cheaters rejoice!

Next time your significant other questions your wandering eye, bring up this article.

It concludes mammals aren't wired for sexual monogamy.

There is, of course, an exception: a specific parasitic worm that lives in the intestines of fish. The article notes, "Among these animals, male and female pair up while adolescents; their bodies literally fuse together, whereupon they remain sexually faithful until death does not them part."

Jealous?