@minimus: No, this somehow got out because we were quite open with some friends and some of this information somehow travelled. So we were eventually counseled on 'using our body parts for proper things' or some such non-sense.
Quite interesting, I'm in no way uneasy about talking about stuff like that, even back then to the elders, so we had a broad discussion about things that were and weren't allowed in the bedroom. The elders were quite embarrassed about the 'breadth' of my knowledge, some things that the Watchtower just doesn't cover for some reason.
After I quit the JW's I eventually joined some member-only clubs (eg. The Crucible in Washington, DC) to explore that area a bit further .