In the 1950s and 60s, Masters and Johnson studied sexual function in 700 people who agreed to have their sex or self-pleasure watched under close scientific scrutiny.
The researchers measured bodily responses and studied the vagina during orgasm by placing a camera in a clear plastic penis.
One important contribution was defining the four-stage model of sexual response, which they described as the human sexual response cycle defined as:
Excitement phase (initial arousal) Plateau phase (at full arousal, but not yet at orgasm) Orgasm Resolution phase (after orgasm)
Their findings, particularly female sexual arousal and orgasm dispelled many long-standing misconceptions and brought attention to sexual dysfunction.
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