Unfortunately since there is no way to retroactively populate the database, the newly created  rimming category on the search database will not be of much use for quite some time.  You are just going to have to read a shitload of reviews to find what you are looking for.  As with all things, YMMV but I believe with this particular activity it really rings true.

There are two reviews one on 6/30 and another on 7/1 that discuss be rimmed.  

From my knowledge, most prroviders only allowed rimming to regulars. The one I knew disappeared on me. She used fake photos most of the time when posting.