三级：史上最伟大的成人电影

A look at a plethora of pornographic films ranging from the 1970s to the 2010s and a commentary about their lasting impacts on the adult industry and the world.

porn纪录片。看了N部这种题材的纪录片，没有哪部片子是不提《深喉》和《绿门之后》的，足见这俩片儿的影响力。