This week Mark and Elna look at paraphilias. We learn more about what fetishes are and why some people have a sexual obsession with a certain body part of object.

They also give you a peek behind the leather curtain into the world of masters and dominatrixes and discuss BDSM (bondage, displine and sado-masochism).

On Health24, you can learn more about the different kinds of paraphilia. We explain when you should be worried about someone and when sex becomes compulsive.