This site is DDF's take on BDSM. In 599 videos with a total runtime of over 177 hours, there is pissing, fisting, bondage with a lot of latex and leather.
The great majority of the scenarios are lesbian ones, though there are a few with either a male dominant running the scenario or being used as the submissive plaything.
There are also a number of doctor and/or nurse scenarios. This really is not dungeon BDSM as much as it focuses on the play rather than the environment in which the scenario is played out.