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In this article, “sex” is used to refer to readily observable somatic characteristics (e.g., genitals). As a result, physical markers of putative biological processes, or “biomarkers,” might help inform our understanding of the process of psychological sexual differentiation 4. Variations in testosterone exposure may thus leave a “fingerprint” on the body along with shaping the brain and subsequent behavior. Brain development occurs in parallel with the development of other physical characteristics (e.g., genital formation 7). Neurohormonal theory argues that sex differentiation of the brain and body is largely due to the influence of gonadal hormones (e.g., testosterone) during pre- and perinatal development 2, 3, although genetic and immunological factors likely also play a role 4, 5, 6. The precise roles of biological mechanisms in the development of sex differences are as yet not entirely clear. Sex differences in the body, brain, and behavior are among the largest dimensions of variation in humans 1. Thus, it appears the various anthropometrics inform separate biodevelopmental processes that differentially relate to sexual orientation and gender identity/expression depending on the measure in question as well as birth-assigned sex. Groups of individuals who tend to be more masculine (i.e., toms, lesbians) showed more male-typical patterns on weight and leg length than some groups of individuals who tend to be less masculine (i.e., heterosexual women, dees). In birth-assigned females, there were no clear sexual orientation effects, but there were possible gender-related effects. Using regressions, in birth-assigned males, less male-typical second-to-fourth digit ratios in the left hand were associated with sexual orientation towards men regardless of gender identity/expression, whereas shorter height and long-bone growth in the arms and legs were more evident among sao praphet song-who are both sexually oriented towards men and markedly feminine. Exploratory factor analyses indicated the biomarkers should be analyzed independently. We examined eight anthropometrics in 1404 Thai participants varying in sex, sexual orientation, and gender identity/expression: heterosexual men and women, gay men, lesbian women, bisexual women, sao praphet song (transgender birth-assigned males), toms (transgender birth-assigned females), and dees (birth-assigned females attracted to toms). The biodevelopment of psychological sex differentiation is putatively reflected in several anthropometrics.