• Excess of counterclockwise scalp hair-whorl rotation in homosexual men

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      https://www.ias.ac.in/article/fulltext/jgen/083/03/0251-0255

    • Keywords

       

      sexual orientation; homosexuality; human behaviour; hair-whorl orientation; behaviour biology

    • Abstract

       

      While most men prefer women as their sexual partners, some are bisexual and others are homosexuals. It has been debated for a long time whether a person’s sexual preference is innate, learned, or due to a combination of both causes. It was recently discovered that the human right-versus-left-hand use preference and the direction of scalp hair-whorl rotation develop from a common genetic mechanism. Such a mechanism controls functional specialization of brain hemispheres. Whether the same mechanism specifying mental makeup influences sexual preference was determined here by comparing hair-whorl rotation in groups enriched with homosexual men with that in males at large. Only a minority of 8.2% (n = 207) unselected ‘control’ group of males had counterclockwise rotation. In contrast, all three samples enriched with homosexual men exhibited highly significant (P< 0.0001), 3.6-fold excess (29.8%,n = 272) counterclockwise rotation. These results suggest that sexual preference may be influenced in a significant proportion of homosexual men by a biological/genetic factor that also controls direction of hair-whorl rotation.

    • Author Affiliations

       

      Amar J. S. Klar1

      1. Ijamsville, MD - 21754, USA
    • Dates

       
  • Journal of Genetics | News

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