Are heterosexuals, bisexuals, and homosexuals arbitrary divisions on a continuum of sexual orientation, or is it useful to divide people into discrete categories? Our cluster analysis of the Klein Sexual Orientation Grid (KSOG) addresses this important question. In two Internet-recruited samples (women, n = 786; men, n = 1,017) we chose a five-cluster classification (Heterosexual, Bi-Heterosexual, Bi-Bisexual, Bi-Homosexual/Lesbian, and Homosexual/Lesbian) and tabulated means and standard errors for KSOG items by cluster membership. Sometimes expected and sometimes surprising, our interpretations shed light on some aspects of bisexuality.
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