You can ask Totem to add a category.
I have seen others ask in the past, however if the cards themselves are not "tagged" with that specific category already then they won't come up even if there is category offered for it. Since there are over 3300 cards and counting, it would take someone quite a long time I'm thinkin, to go through them all to see if "bubble butt" or whatever would apply to them or not and then add the specific tag to that card if applicable.
Not saying it isn't possible or even if it will or won't happen eventually but I would not expect it to happen anytime soon, even if Totem agreed to do it. Totem are still working out some bugs in the GUI and have quite a list of things to accomplish I think before they can turn their limited staff to this sort of thing. It's a work in progress here for sure but to their credit, they (Totem) do respond to us members and they turn out updates to the GUI program and the site as a whole quite regularly.
I love this thing and really enjoy the format here. It's considerably different from most of the other adult entertainment available out there.
Enjoy the girls!
P.S. if you are into "healthy" girls look up Nekane (one of my favorites), Lexi Bell, Kyra Hot or Bettina de Capri. They all have nice "tail sections" imho.