Greatest Female Adult Entertainers - Top 10 Entertainment

The adult entertainment industry has always been the black sheep of the American economic family. Less respectable than Big Oil and Hollywood, it's been no less successful, with annual sales estimates ranging from $2 to $12 billion per year. And, unlike oil and tech companies -- but very much like Hollywood -- the porn industry has produced some extremely recognizable, er, faces. 

As Twitter has made assessing celebrity popularity much more easily quantifiable, the embarrassing truth is out: Many porn stars have more followers than professional athletes. Hell, many professional athletes are following porn stars on Twitter. And with every new film or television show starring or featuring a porn star, the barrier between mainstream and adult entertainment grows smaller and smaller.

So, without any further delay, here are the 10 greatest female porn stars to ever live. Go ahead, click through and pretend you don't know any of them. We won't tell.