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The altered state experienced during orgasm is caused mostly by endorphin release, which is mentioned here.
And I agree that "altered state of consciousness" is hard to define; after all, the state of the mind is transient and ever-fleeting, and therefore it is hard to say just what is...
I'm working on a project detailing my experiences with altered states, with and without psychoactive drugs. So far I have read up on the following methods:
-Meditation
-Yoga
-Fasting
-Sensory deprivation
-Sleep deprivation
-Endorphin release
-Music
-Brainwave entrainment (binaural beats, etc.)...