Gay Naturists International (GNI)
http://www.gaynaturists.org/
International Men Enjoying Naturism (IMEN)
http://www.imengonude.org/
California Men Enjoying Naturism (CMEN)
http://www.cmen.info/
Spikes Naked Planet: Directory of Gay Nudist Groups
http://vered.rose.utoronto.ca/planet/index.html