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Fritz Klein; studied bisexual culture; 73

SAN DIEGO -- Dr. Fritz Klein, 73, a psychiatrist who studied bisexuals and their relationships, helped launch a foundation promoting their culture, and organized bisexual support groups in New York, died of a heart attack May 24 at his home in San Diego, said his partner, Tom Reise.

Dr. Klein's life work was defined by his belief that sexual orientation is fluid and changes throughout a person's life. He believed that the number of men who were sexually active with both sexes had been undercounted and unrecognized by the scale developed by Alfred C. Kinsey in the 1940s.

Working at his private psychiatric practice in the 1970s, Dr. Klein developed a scale that measured not only sexual experiences, but sexual attractions, emotional preferences, social preferences, and self-identification pertaining to a person's past, present, and ideal future.

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