The first systematic surveys of sexual behavior were conducted in the 1950s by ________.

A) Masters and Johnson
B) Virginia Johnson
C) Alfred Kinsey
D) Sigmund Freud

The first systematic surveys of sexual behavior were conducted in the 1950s by Alfred Kinsey, who is known for his groundbreaking research on human sexuality. Masters and Johnson were also pioneers in the field of sex research, but their work focused more on the physiological aspects of sexual response, while Kinsey's research explored a broader range of topics related to sexuality and sexual behavior. Virginia Johnson was a collaborator with Masters on their research, and Sigmund Freud was a psychoanalyst who developed theories about sexuality in the early 20th century.