She doesn't do them. Not that she won't, she can't. I forget exactly how it happened, but about 15-ish years ago, she tore part of her anus, and anal physically hurts her. She's talked about it on Twitter, if you want to go check out her feed.
There's a funny story she recounts on an episode of Holly Randall's podcast. I forget the performer she was working with, but there was such a connection between them that, before the scene even began shooting, they just started screwing like rabbits.
