Happy to see others that feel this way; that it isn't just me.

The reference to masturbation is fortuitous. Around here, you get old-time jams that essentially involve three or four fiddlers, maybe a banjo player, standing in a tight, closed, circle and playing the same (simple) tune over and over for twenty minutes, in a sort of trance. It's exceedingly dull for everyone but those few musicians. The phenomenon is referred to locally as a "fiddlers' circle-jerk."

Peter.