What made the work of Masters and Johnson so relevant?

William Masters and Virginia Johnson have been widely recognized for their contributions to sexual, psychological, and psychiatric research, particularly for their theory of a four-stage model of sexual response (also known as, the human sexual response cycle) and their study of sexual response among the elderly.

What was the topic of groundbreaking research conducted by Masters and Johnson?

With partner Virginia E. Johnson, Masters conducted groundbreaking research on sex physiology and in 1964 established the Masters & Johnson Institute (originally the Reproductive Biology Research Foundation), a clinic for couples who suffered from sexual dysfunction.