In October Sky starts its 3D service - their are no plans as yet for any of the adult channels to go 3D. Here is a window of oppertunity high definition 3D DVD discs - will work on the new 3D System. The equipment costs for making the films either the quality euro stuff with attractive cast /preformers and the so called "home made" reality stuff is easily avaliable and useable. The subject matter itself is ideally suited for 3D. Of course it would be shot in both 18R restricted to licenceced sex shops and softer 18 version -less close ups but still in 3D dimensions.
Do not forget there is also a thing called 4D -which has some physical sensor effects - used at theme parks and visitor attractions.
the stewerdesses 3d trailer is on www.youtube.com