We have a really good list at this forum post:

https://www.istripper.com/forum/thread/53518

关于iStripper的一切 / Cards with Dildo Ride

I'm a fan of the clips where the girl sits on the dildo and rides it. Generally I buy cards if I notice that position in the pictures, but sometimes they don't end up doing it in the clips themselves....

We are still actively updating it with new (or newly discovered) riding cards, so you can find a lot of good ones there. We don't always describe "front" or "back" but I usually try to give a short description. Check it out!