This hypothesis contrasts with the predominant suggestion of fixed organizational effects of androgens in the brain and a categorical sexual orientation. We hypothesize a continuous neurohormonal sexual differentiation of the brain, most notably for women, that overrides categories and results in varying dimensions of sexual orientation. Our results indicate that with higher prenatal testosterone levels in women, the likelihood of homosexual orientation might increase. We found a significant negative correlation of 2D:4D with homosexual orientation (fantasy, attraction, activity and general score) in women, but not in men. We examined a community-based sample of 409 subjects and calculated correlations of 2D:4D and sexual orientation as a continuum ranging from homosexual to heterosexual. The purpose of our study was to evaluate 2D:4D and the dimensional perspective of sexual orientation in addition to categorical results. To date, most studies in this field of research comprise categorical group comparison of heterosexuals and homosexuals with respect to their 2D:4D. ![]() Bearing this in mind, 2D:4D has been tested as a proxy measure of the putative prenatal testosterone impact on adult human homosexuality, but the results are inconsistent. The ratio between lengths of the second and the fourth digits (index and ring fingers) (2D:4D) is a putative biomarker of prenatal testosterone and estrogen exposure 1. To test this hypothesis, the researchers collected data on finger length and 2D:4D ratio from over 7,500 people, including representatives of the three big races, different ages and nationalities. The study aimed to determine the relationship between digit ratios among a motherchild population in Ghana. It has been suggested that both adult sexual orientation and the 2nd to 4th finger length ratio (2D:4D) are influenced by prenatal testosterone levels. Testosterone promotes growth of the fourth finger and thus tends to produce lower 2D:4D ratios in men, while estrogen has the inverse effect and thus causes.
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