If you're concerned with that you should be concerned if she's seen ANYONE before you. Are you under the impression that they don't get clean after they see someone? If she took 5 dicks yesterday, somehow this morning she's fully reset and undicked? You're looking for a nun that cosplays as a provider I think.
It probably has more to do with a topic that has been discussed here before, namely how well the the ladies clean up in between clients. Some do, some don't. I suppose one wouldn't want to to be with the ones that don't. (and I have been witness to them not really cleaning up much, so it certainly happens)