Society of Janus
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The Society of Janus is a San Francisco, California based BDSM education and support group, and is the second oldest BDSM organization in the US. It was founded in August 1974 by the late Cynthia Slater and Larry Olsen.
The Society of Janus is nonprofit, volunteer run and is devoted to the art of safe, consensual and non-exploitative adult power exchange. They publish a bimonthly newsletter called Growing Pains and a monthly schedule of BDSM events called Rapid Release which are mailed to members.