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The British Journal of Psychiatry 160: 407-409 (1992)
© 1992 The Royal College of Psychiatrists

Homosexuals who are twins. A study of 46 probands

M King and E McDonald
Royal Free Hospital School of Medicine, London.

Forty-six homosexual men and women who were twins took part in a study of their sexuality and that of their co-twin. Discordance for sexual orientation in the monozygotic pairs confirmed that genetic factors are insufficient explanation of the development of sexual orientation. There was a high level of shared knowledge of sexual orientation between members of twin pairs, and a relatively high likelihood of sexual relations occurring with same sex co-twins at some time, particularly in monozygotic pairs. The implications of these results for the study of the origins of sexual orientation and for twin research are discussed.


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Copyright © 1992 The Royal College of Psychiatrists.