The document discusses the social construction of heterosexuality and heterosexual norms from the 19th century to mid 20th century. It describes how in Victorian times, sex was seen as only for procreation within marriage, but by the 1860s the focus shifted to pleasure and consumption. The concept of "heterosexuality" was first used medically in 1892 to establish heterosexual norms and portray all other sexualities as deviant. By 1945-1965, heterosexuality became firmly established as the dominant norm through institutions and media. Researchers like Kinsey challenged these heterosexual norms by arguing sexuality exists on a continuum rather than in rigid categories.