Final answer:
Masters & Johnson's research in the 1960s is renowned for observing and recording physiological responses during sexual activities, which provided new insights into human sexual behavior and response cycles.
Step-by-step explanation:
The research of Masters & Johnson in the 1960s is noted for its groundbreaking studies on human sexual response and behavior.
By directly observing nearly 700 individuals engaging in sexual activities, they were able to record physiological measurements such as blood pressure, respiration rate, vaginal lubrication, and penile tumescence.
Their extensive observations of nearly 10,000 sexual acts allowed them to gain unique insights into the sexual response cycle, disprove myths about sexual anatomy and pleasure, and demonstrate the elasticity of the vagina, among other findings.
Although their methodologies have been both criticized and refined over time, Masters and Johnson's research provided invaluable data and significantly advanced the field of sexology.