He completed an undergraduate degree in sociology at the University of Toronto in 1956, and earned a Ph.D. from the University of Sussex in 1971. He then joined the University of Toronto as a faculty member in 1971. Teaching at the university until his retirement in 1999, he was the author of over 300 books and articles in sociology, predominantly focusing on sociological study of the LGBT community and on the broader psychology of love and sexuality. His articles appeared in publications including the Canadian Journal of Higher Education, the Journal of Homosexuality, Psychology Today, The Body Politic, Canadian Forum and Christopher Street. His most noted books were The Colours of Love, the first prominent work of research into the concept of love styles, and Getting Sex, a study of gay sexual cruising.
Activism
In 1964, Lee began working as an "undercover gay activist", writing letters to various publications to protest unfair and biased depictions of LGBT people and writing more balanced pieces of his own. Initially undertaking this work anonymously or under pseudonyms, in 1974 he officially came out on TVOntario's The Judy LaMarsh Show, becoming one of Canada's first professional figures ever to come out as gay. In 1975, he was one of the founders of the University of Toronto's Gay Academic Union. In 1979, he was an organizer of an LGBT rights protest which consisted of a three-day sit-in in the offices of provincial Attorney GeneralRoy McMurtry. Following Operation Soap in 1981, he was one of the founders of the Right to Privacy Committee. He was also active in other organizations, including the Sierra Club, Amnesty International and the Religious Society of Friends. Late in life he was active in Dying with Dignity, a Canadian right to die activist group. Although in poor health he was not terminally ill, but advocated that he should have the right to die on the grounds that his life was complete and he no longer had anything new he wanted to accomplish or achieve. During this era, he also published his autobiography, Love's Gay Fool, as a free document on his own website. He ended his life on December 5, 2013.
Honours
In honour of his role as a significant builder of LGBT culture and history in Canada, a portrait of Lee, by artist Norman Hatton, is held by the The ArQuives: Canada's LGBTQ2+ Archives' National Portrait Collection. The archives also now hold many of his personal papers and records from throughout his career.