in 1919–1920, while Kinsey was still a doctoral student at the Bussey Institute, and Fernald was working at the Arnold Arboretum. Sexology The Kinsey Reports Kinsey is widely regarded as the first major figure in American sexology; his research helped pave the way for a deeper exploration into sexuality among sexologists and the general public, as well as liberating female sexuality. For example, Kinsey's work disputed the notions that women generally are not sexual and that female orgasms experienced vaginally are superior to clitoral orgasms. He initially became interested in different forms of sexual practices in 1933, after discussing the topic extensively with a colleague, Robert Kroc. Kinsey had been studying the variations in mating practices among gall wasps. During this time, he developed a scale measuring sexual orientation, now known as the Kinsey scale, which ranges from 0 to 6, where 0 is exclusively heterosexual and 6 is exclusively homosexual; a rating of X for "no socio-sexual contacts or reactions" was later added. In 1935, Kinsey delivered a lecture to a faculty discussion group at Indiana University, his first public discussion of the topic, wherein he attacked the "widespread ignorance of sexual structure and physiology" and promoted his view that "delayed marriage" (that is, delayed sexual experience) was psychologically harmful. Kinsey obtained research funding from the Rockefeller Foundation, which enabled him to further study human sexual behavior. He published Sexual Behavior in the Human Male in 1948, followed in 1953 by Sexual Behavior in the Human Female, both of which reached the top of the bestseller lists and turned Kinsey into a celebrity. These publications later became known as the Kinsey Reports. Articles about him appeared in magazines such as Time, Life, Look, and McCall's. The Kinsey Reports, which led to a storm of controversy, are regarded by many as a precursor to the sexual revolution of the 1960s and 1970s. Controversial aspects Kinsey's research went beyond theory and interview to include observation of and participation in sexual activity, sometimes involving co-workers. Kinsey justified this sexual experimentation as being necessary to gain the confidence of his research subjects. He encouraged his staff to do likewise, and to engage in a wide range of sexual activity, to the extent that they felt comfortable; he argued that this would help his interviewers understand the participants' responses. Kinsey filmed sexual acts which included co-workers in the attic of his home as part