I am not aware of any pay by the hour motels in all of dfw. Are there any? Any place that rents,a room for less than 10 hours gets classified as an adult hotel with increased code requirements and enforcement.
There's one off 35 & Ann Arbor.South Dallas. Its pretty shady though, but serves its raunchy purpose I went twice with a marine "friend" if mine so I felt safe with him. Just FYI.
Dude, if that's what your looking for go to those Adult Book Stores and get ya' a video room for $ 20.00 and when ya leave they give ya your $ 20.00 back. I cant remember the name, New Fine Arts is one, there is a few others and these establishments are clean & not bed bug infested rat traps.