monogamy

Perhaps you’re thinking you don’t know any non-monogamous people. But I wouldn’t be too sure.

A groundbreaking study from a Harvard University team suggests that monogamy may be genetically programmed within some mammals.

One reason: women perceive men with tattoos as more likely to cheat.   

How open are you to your partner having sex with other people? The answer may depend on your age.

Your ring-to-index finger ratio can tell a lot about what you’re good at and even what mental disorders you are prone to.   

Which came first, monogamy or the social contract? Evolutionary psychologists and biologists think the latter.