The human toilet view needs a camera directly below the performer, protected and still. Creators have found three ways to do that.
Glass plate
A sheet of glass or acrylic over the camera, the performer squatting on top. Clean images, but anything on the glass stays in view.
Toilet insert
A waterproof camera inside the bowl or a seat-mounted rig. Closest to the real perspective, hardest to light.
Floor rig
The camera on the floor under a chair or frame, often wrapped in plastic. Flexible, and the most common for full-body scenes.
See the POV rows on the front page, or read about verbal human toilet clips.