'Back in the day' when I was entangled in the BDSM community (and not married), I met most of my playmates and Dommes via internet. Of that bunch, most were met on AOL either in chat rooms or in IM conversations. Unfortunately, I never got to meet friends off this forum or other BDSM-related sites.
Outside of the o/l world, not too many ppl. know of my BDSM interests. I had a few g'friends take interest in the topic, but I never met a stranger outside the o/l world for BDSM acts.