In their effort to describe the stages of the human sexual response,researchers Masters and Johnson

A) observed chimps and monkeys engaging in sex.
B) interviewed married couples who were randomly selected from the U.S.population.
C) interviewed only married couples who had regular sex.
D) directly observed people engaging in sex in their laboratories.

Human Sexual Response

A series of physiological and psychological states that describe the human body's reaction to sexual stimulation.

Masters and Johnson

Pioneers in the field of sexology; they conducted extensive research into human sexual response and the diagnosis and treatment of sexual disorders and dysfunctions.

Engaging in Sex

The act of participating in sexual activities, which can encompass a wide range of behaviors between individuals.