The human sexual response cycle is a four-stage model of physiological responses to sexual stimulation,[1] which, in order of their occurrence, are the excitement, plateau, orgasmic, and resolution phases.[2] This physiological response model was first formulated by William H. Masters and Virginia E. Johnson, in their 1966 book Human Sexual Response.[1][3] Since that time, other models regarding human sexual response have been formulated by several scholars who have criticized certain inaccuracies in the human sexual response cycle model.
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