We’ve heard this one before, but maybe you haven’t. Want to know a lot about a guy at a glance? Look at his hands. Is his ring finger longer than his index finger? If so, scientists think he probably got an extra dollop of testosterone in the womb, and he’s more likely to be “a promiscuous, extroverted go-getter with strong muscles.”

In case you’re thinking that’s the kind of guy you want (or if that’s the kind of guy you already are), be careful—because those longer ring-fingered men “also have a higher chance of ending up in prison, being murdered or going mad.”

According to news reports, research has shown women who have “masculine” hands, with long ring fingers, are more likely to be lesbians and also display higher levels of aggression. Puhhlease, though—bear in mind, we’re talking average tendencies here, not cut-in-stone facts.