Sasha Grey, Lauren Phoenix, Monica Sweetheart, Simone Peach, Brianna Love (if she's still active), Tory Lane, Katja Kassin, and I'm sure I'm missing someone.
Basically I'm not against a some chicks doing it but when a chick has a perfect looking asshole (for my tastes) like those I've listed, I just hate to see a cock gouging their assholes every other scene they're in.
Two or three scenes maybe but then let that be it. Preserve the pucker!!!
Part of the attraction to many of these chicks is their perfect puckers...getting them ruined by cocks kind of takes away from some the attraction to them.
Taylor Rain had probably the best looking asshole in porn at one time....while it's not bad now it's not the perfect, needle prick it started out as. But she certainly made the best of it....you almost couldn't recognize her asshole without a cock in it there for a minute....