Not "A" list Mainstream but definitely considered mainstream in the B-Movie category.

A FIRST for a Well-Known Adult Star. Starting in MAY on HBO/Cinemax. CHLOE stars as the female series regular in the new late night series "Sex Games:Vegas". And for you non believers. The role was a heavy dialog driven role and in 13 episodes CHLOE has only 3 simulated love scenes.

And late night cable being a form of mainstream there are a lot of known adult stars who appear nightly in these programs that air on Cinemax, DirecTV, BSkyB, HBO Ole' etc.