Do you like R-rated movies with steamy sex scenes? Most people do. There’s a little bit of voyeur in most of us.

Do you ever wear tight, form-fitting, or revealing clothing? Most people do from time to time at the beach, the gym, or socially. There’s a little bit of exhibitionist in most of us, too.

But how many people are really deeply into watching sex or exposing themselves in public? That’s been a mystery—until recently, when the journal Archives of Sexual Behavior published a Swedish study that investigated voyeurism and exhibitionism.