Bulging Jockstraps(1987)

Remember when porno films were called "educational films"? Well, Bulging Jockstraps, part documentary, part embarrassment of riches for jockstrap fetishists, could actually be classified as educational. The first few minutes covers the history of athletic supporters in great detail, with some awesome vintage advertisements and images of models in obsolete "suspensory bandages". The rest is a virtual kaleidoscope of hung hotties in every conceivable kind of jockstrap. Some masturbate, others suck and fuck, and a few perform amazing feats like twisting their cocks and balls with the jockstrap so that they appear as engorged pretzels.