While the show presents Masters as a fairly progressive and empathetic guy in terms of homosexuality—the subplot story of the closeted dean is truly heartbreaking—he had a complicated relationship with his gay and lesbian patients, to say the least. From the late '60s to the early '70s, Masters and Johnson claim to have treated or "converted" many gay patients. Their controversial 1979 book Homosexuality In Perspective was positive in that it didn't portray homosexuality as mental disorder per se, but further pushed their belief that homosexuality is a choice and not an orientation. (Masters' research has been accused of being entirely falsified.) The American Psychiatric Association now condemns conversion therapy and virtually all reputable medical professionals agree that it unethical. There's no avoiding the fact that this is a disturbing black mark on Masters and Johnson's legacy.