Pheromones

A chemical substance produced by some organisms and emitted into the environment to communicate with others of the same species. Pheromones play an important role in the social ...

pheromone

Biotechnology; Genetic engineering

A hormone-like substance that is secreted by an organism into the environment as a specific signal to another organism, usually of the same species.

pheromone

Chemistry; Materials chemistry

A chemical compound made by one animal that affects the behavior of other animals of the same kind.

Sigmund Freud

Health care; Sexual health

(1856–1939) Influential psychoanalyst who believed that we must understand human sexuality if we are to understand human nature. He understood that children have strong sexual ...

Havelock Ellis

Health care; Sexual health

(1859–1939) English author of Studies in the Psychology of Sex (1903–28). Until 1935, Ellis’s Studies, which argued that erotic dreams, foreplay, and masturbation were normal, ...

Katharine Bement Davis

Health care; Sexual health

(1860–1945) Completed the first major study on women’s sexuality, Factors in the Sex Lives of Twenty-Two Hundred Women, which was published in 1929. She gathered data for more ...

Magnus Hirschfeld

Health care; Sexual health

(1868–1935) German sexologist who founded the Institute of Sexual Science in Berlin in 1919. He studied human sexuality in order to provide counseling for sexual problems. He ...

Marie Carmichael Stopes

Health care; Sexual health

(1880–1958) Opened the first British birth control clinic in 1921. One of her books, Married Love, was declared obscene by the U. S. Customs in 1921 because it described the ...

Margaret Sanger

Health care; Sexual health

(1883–1966) Founder of Planned Parenthood Federation of America, Margaret Sanger began her career as a nurse who fought to legalize birth control in order to prevent women from ...