Apparently, they've got college kids to provide the impetus and the steering. So far, the only passengers are college girls. Edit: Ah, but who'd want to ride around in a bed with a college girl?
I guess if you had a self driving smart car there really is only one sex position that can be done if you could squeeze two people in there .
Once they come up with driver-less vans, I bet there will be a resurgence of bang brothers porn in the industry. Think of how much better the episodes will be? Instead of having that creepy guy who drives the vans, it'll be Hal 9000.