Center for Sex and Culture

San Francisco, CA.  | http://sexandculture.org/

From their site:  "OUR MISSION: To provide non-judgmental, sex-positive sexuality education and support to diverse populations by means of classes, workshops, social gatherings, and hands-on, practical skills-building events; to maintain and house these events and supporting materials and functions; to maintain a publicly-accessible library and archives; to staff and support this learning environment."