Marilyn Chambers was once the shining example of how a career in porn could be a stepping-stone to something better. She went from being penetrated on a trapeze in 1972’s Behind the Green Door to getting the lead in a David Cronenberg horror film.

These days, nobody gets into porn with ambitions beyond paying the rent and embarrassing their parents. The last example of a porn star making the leap to a mainstream acting career is Sasha Gray, and she managed only to land a forgettable Steven Soderbergh movie and a bit part in Entourage before audiences lost interest. That was a decade ago, and there is no next generation of Sasha Grays. Doing porn today leads to nothing but doing more porn.