Orgasm: Expanded

Wikipedia:
Expanded orgasm is any sexual experience more intense and extensive than what can be described as, or included in the definition of, a regular orgasm.[1] It includes a range of sensations that include orgasms that are full-bodied, and orgasms that last from a few minutes to many hours.[2] The term was coined in 1995 by Dr. Patricia Taylor. It was used in her Ph.D. research of intense sensual experiences of 44 couples from various backgrounds and referenced in a video she produced in 1998.
Distinguishing features of expanded orgasm are energetic sensations and contractions all over the body, especially in the abdomen, inner thighs, hands and feet, and of course the genitals. Dr. Taylor describes reports of practitioners going into various altered states of consciousness, bringing about deep emotional release and rejuvenation, profound spiritual experiences, having awarenesses not normally perceived in regular orgasm, and perceiving energy expanding beyond the limits of their bodies.[3] Similar experiences were reported in studies by Dr. Jenny Wade,[4] and by David Deida.[5]
Dr. Taylor reports that men are as likely as women to go into these states and have all the experiences enumerated above.[3] In addition, both Brauer[10] and Bodansky[11] discuss male extended orgasm.
Theories for the biological processes required for achieving these states include the progressive and balanced stimulation and elevation of the sympathetic and parasympathetic nervous system; this is evidenced by the tantric practice of using breathing techniques[12] (to engage the parasympathetic nervous system) during sexual activities.
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