Frederick Hollick (1818-1900) was a 19th-century American physician, sex educator, and author. His most notable works include The Origin of Life and The Marriage Guide, both of which focus on teaching healthy sexual practices and behavior, as well as proper knowledge of the reproductive processes and management of diseases. Hollick’s beliefs were controversial for the time period since many health professionals at this time were against discussing sex and functions of the human body in a public sphere.