I have the impression that in our society mainly females can use their looks/sexuality as an step in their careers. There are numerous female porn-stars that started in the adult-industry and transitioned succesfully to a more "mainstream" careers in music/fashion/art.

The Kardashian Sextape (i know its not the only reason why she is famous).

I also see more female fashion models transition from the model-job to acting for example.

What are the reasons for this? I know that these examples go mainly for the entertainment-industry.

This is a serious question.