In 2019 a “genetic app” titled “How Gay Are You?” was published on GenePlaza (Maxmen 2019), immediately following the publication of a headline-making genetics study on same-sex sexual behavior (Ganna et al. 2019; Belluck 2019). In response to widespread outrage, the app was quickly discontinued (Bellenson 2019). But, rather than a rogue misapplication of responsible science—as the study's authors and others decried it—this debacle is emblematic of the pitfalls inherent in the new era of sexual genetics. In this essay we introduce the central methods, concepts, and key terms in the field of sociogenomics and related genetic sciences. We then review high-profile claims from this field that posit genetic theories of gender and sexuality, or that analyze gender and sexuality as variables in the characterization of brain, psychiatric, and medical conditions. Last, we characterize the conceptual, methodological, social, and ethical questions opened by this new frontier...

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