Why is there so much incest in fantasy novels?

Are the authors just perverts?

Aslam2014-08-15T18:47:08Z

Because incest among consenting individuals can be an amazing thrill.

Isis2014-08-14T00:25:56Z

They're tryna get the wow factor and ****, make stuff more interesting and if its kinda historical, accurate

The Man With A Plan2014-08-14T00:21:47Z

Too much hoobly wooblu