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Fritz Klein

BMJ 2006; 333 doi: (Published 29 June 2006) Cite this as: BMJ 2006;333:47

Psychiatrist who pioneered research into bisexuality and who invented a sexual orientation grid

Recognising his attraction to both men and women, in 1974 Dr Fritz Klein tried to research bisexuality at the New York Public Library. He found little information. So he placed an advertisement in The Village Voice, a weekly newspaper in New York's Greenwich Village, asking people interested in bisexuality to meet for discussions.

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“I had bisexuals come to my place every week to discuss their own bisexuality as well as bisexuality in general,” he told journalist Sheela Lambert of BiMagazine in an interview weeks before his death. “We met weekly for discussion and it quickly turned into a support group. We had about 15-20 people show up every week.”

From these discussions Klein developed his Klein Sexual Orientation Grid, which considers a person's sexuality in the past, present, and an idealised future, and published it in the Journal of Homosexuality in 1985. It was based on the Kinsey Scale, which rated sexual orientation on a scale of 0 to 6, with 0 being …

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