Plot and acting are superior to most seen today, and the sex scenes not only fit the plot, they advance the plot. Although the sex is by today's standards strictly couples fare, this is still a very hot movie and well worthwhile.
Technically the disc is quite good, although the reverse angle gimmick was simply annoying. The video quality and audio are very good, given the age of the source material. There is a full-motion chapter stop menu and some stills, but no other extras, not even any trailers.
If you're interested in seeing what people mean when they talk about the golden age of adult, i.e., plot, acting, good productions values, good sets, even good exterior shots, watch this movie.