Changes in societal norms and human psychology can mean that some things that once seemed perfectly normal suddenly become taboo — so unpicking the murky world of perversion can be both interesting and difficult.
Once upon a time, having sex with your wife was perverted, but having sex with a seven-year-old wasn't. That's, um, no longer the case. Allow this video to shed a little light on the changing face of the pervert. [YouTube]