Researchers have long argued that marriage generally reduces illegal and aggressive behaviors in men. It remained unclear, however, if that association was a function of matrimony itself or whether less "antisocial" men were simply more likely to get married.

The answer, according to a new study led by a Michigan State University behavior geneticist, appears to be both.

In the online December issue of the Archives of General Psychiatry, S. Alexandra Burt and colleagues found that less antisocial men were more likely to get married. Once they were wed, however, the marriage itself appeared to further inhibit antisocial behavior.