American sex researcher and writer Clyde Martin was BOTD in 1918. His place of birth and family origin is unknown, though academic records show he enrolled at Indiana University Bloomington in 1937. Troubled by his bisexuality, he sought out biology professor Alfred Kinsey, who at the time was running a popular sex education course for married students. Martin confided his sexual history and financial difficulties to Kinsey, who offered him a part-time job as his gardener. Martin became involved with Kinsey’s study of male human sexual behaviour, helping tabulate Kinsey’s survey results, and was appointed the project’s first paid research assistant in 1941. The married and latently bisexual Kinsey became increasingly attracted to Martin, using his seniority to pressure him into an affair. Realising that he was predominantly heterosexual, Martin had an affair with Kinsey’s wife Clara, with Kinsey’s reluctant blessing. In 1942, Martin married his girlfriend Alice in the garden of the Kinsey’s home. With fellow researchers Wardell Pomeroy and Paul Gebhard, the Martins became part of Kinsey’s “inner circle”, encouraged by Kinsey to record their conjugal behaviour, sleep with each other and participate in pornographic research films. Martin was named as a co-author of Kinsey’s 1948 report Sexual Behaviour in the Human Male, and credited with calculating the study’s many groundbreaking statistics (including the much-quoted finding that one in ten men reported some kind of homosexual experience). An immediate bestseller, the book continued shocked post-war America with explicit detail about male sexual practices, and helped establish homosexuality as a coherent social identity. Martin worked with Kinsey on his follow-up study on female sexuality, correcting a number of statistical and methodological errors in response to criticism of their earlier work. Published in 1953, Sexual Behaviour in the Human Female, caused public outrage with its frank discussions of female masturbation, pre- and extra-marital sex and lesbianism. After Kinsey’s death in 1956, Martin continued to work at Institute for Sex Research, resigning in 1960 to pursue doctoral study at Johns Hopkins University. In 1966, he became a researcher in gerontology and sociology at the Francis Scott Key Medical Centre in Baltimore, Maryland. He retired in 1989, and died in 2014, aged 96. He was played by Peter Sarsgaard in Bill Condon’s 2004 biopic Kinsey. His relationship with the Kinseys was fictionalised in T. Coraghessan Boyle’s 2004 novel The Inner Circle.