Here's a tip: If you want to find cool stuff from Japan, check out Yahoo Auction at Yahoo's Japan site. The fact that it's in Japanese scares off a lot of people. But if you can navigate that particular hurdle, I'm told you can find what you're looking for.
That's how this particular find happened: two long out-of-print vintage VHS tapes of the father of live SM shows in Japan, Osada Eikichi.
These two videos, Orgasm I and II, are from 1983 and are real collectors' items. These videos take us back to the sunset of celluloid and the dawn of videotape.