Most of us think compatibility and love are the greatest predictors of marital success, but research keeps proving otherwise. Or at least, there are a whole bunch of factors that supposedly determine whether you stay hitched or end up splitting. Like how big your wedding is or how long you

 Pound pavement together. Couples who do so spend more time in the sack, according to a new survey from the Brooks Running Company.  Roughly 66 percent of 1,000 survey respondents said they had more sex if they ran with their partner, according to the data. But does medical research back up those

Even your sex life is subject to survival of the fittest. New research suggests more involved dads have less sex—and that's to protect the species. According to research from Emory University published in the Proceedings of the National Academy of Sciences, dads who were more involved with their

Every new year brings another spate of bonkers sex research. This year was no different.  Have you ever wondered what percentage of people fantasize about sex with animals? How about the likelihood that the guy next to you on the highway is shakin' his bacon? Researchers in 2014 worked out the

If you've ever been with a dude who had trouble getting it up, his mom may be to blame: Guys who don't have the best relationships with their mothers during childhood are more likely to suffer from erectile problems, according to a recent study published in the Journal of Sexual Medicine. In the