Quote from The Science of Orgasm by Komisaruk.
“[From the Greek meaning] to swell as with moisture, be excited or eager” (Oxford English Dictionary, Simpson & Weiner, 2002a)
“The expulsive discharge of neuromuscular tensions at the peak of sexual response” (Kinsey et al., 1953)
“A brief episode of physical release from the vasocongestion and myotonic increment developed in response to sexual stimuli” (Masters & Johnson, 1966)
“The zenith of sexuoerotic experience that men and women characterize subjectively as voluptuous rapture or ecstasy. It occurs simultaneously in the brain/mind and the pelvic genitalia. Irrespective of its locus of onset, the occurrence of orgasm is contingent upon reciprocal intercommunication between neural networks in the brain, above, and the pelvic genitalia, below, and it does not survive their deconnection by the severance of the spinal cord. However, it is
able to survive even extensive trauma at either end.” (Money, Wainwright & Hingburger, 1991)
“An explosive cerebrally encoded neuromuscular response at the peak of sexual arousal elicited by psychobiological stimuli, the pleasurable sensations of which are experienced in association with dispensable pelvic physiological concomitants” (Kothari & Patel, 1991)
“A peak intensity of excitation generated by: (a) afferent and re-afferent stimulation from visceral and/or somatic sensory receptors activated exogenously and/or endogenously, and/or (b) higher-order cognitive processes, followed by a release and resolution (decrease) of excitation. By this defi nition, orgasm is characteristic of, but not restricted to, the genital system.” (Komisaruk & Whipple, 1991)
“A variable, transient, peak sensation of intense pleasure, creating an altered state of consciousness, usually with an initiation accompanied by involuntary rhythmic contractions of the pelvic striated circumvaginal musculature, often with concomitant uterine and anal contractions, and myotonia that
resolves the sexually induced vasocongestion and myotonia, generally with an induction of well-being and contentment.” (Meston, Levin, et al., 2004)