What was the major contribution made by William Masters and Virginia Johnson?

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William Masters and Virginia Johnson are most known for their pioneering work on the human sexual response cycle, which they described in their book "Human Sexual Response" (1966). They conducted extensive research on sexual physiology, including observing and measuring physiological responses to sexual stimulation through direct observation and laboratory experiments. Their work contributed greatly to our understanding of normal sexual response and paved the way for further research in the field of sexology.

What Was the Major Contribution Made by William Masters and Virginia