During the transition to parenthood (TTP), both women and men report declines in sexual desire, which are thought to reflect an evolutionarily adaptive focus on parenting over mating. New parents also show changes in testosterone, a steroid hormone implicated in both parenting and mating, suggesting that changes in sexual desire may be associated with changes in testosterone. To test these associations, we followed a sample of heterosexual couples expecting their first child across the prenatal period. We examined prenatal changes in testosterone and two forms of sexual desire (solitary, dyadic). Expectant mothers showed prenatal increases in testosterone, and women's higher testosterone was associated with lower dyadic desire. Expectant fathers showed prenatal decreases in testosterone, and declines in men's testosterone were associated with lower dyadic desire. Testosterone was unrelated to men's or women's solitary desire. Our findings provide support for the idea that prenatal changes in testosterone contribute to an evolutionarily adaptive focus on parenting over mating during the TTP.

在过渡到父母身份（TTP）期间，男女都报告了性欲下降，这被认为反映了在进化上对父母养育的重视程度超过了交配。新父母还显示出睾丸激素的变化，睾丸激素是一种与父母育儿和交配有关的类固醇激素，表明性欲的变化可能与睾丸激素的变化有关。为了测试这些关联，我们追踪了一对异性恋夫妇的样本，他们期望在产前期间生育第一个孩子。我们检查了产前睾丸激素的变化和两种性欲形式（单性，双性）。准妈妈表现出产前睾丸激素的增加，而女性睾丸激素的升高与二进性欲望的降低有关。准父亲表现出产前睾丸激素下降，男性下降 s的睾丸激素与较低的二元愿望有关。睾丸激素与男人或女人的孤独欲望无关。我们的发现为TTP期间产前睾丸激素改变有助于进化适应性关注父母养育的观点提供了支持。