我們對現代的關係有根深蒂固的觀念：也就是，男人和女人只能有一對一的關係。但農業社會開始之前，人類也許是有多重性伴侶的。作者克里斯多福．瑞德透過備受爭議的證據，帶領我們了解人類天性是性雜食性的。他希望人們進一步的了解可以讓彼此的關係不再被歧視、羞恥，或是各種不切實際的期待而破壞。

我們生來就是性雜食動物嗎？

Human beings evolved in small, egalitarian hunter-gatherer groups where sharing—including overlapping sexual relationships—was the norm. Before agriculture, sexuality helped build flexible social networks, challenging the modern idea of lifelong, sexually exclusive pair bonds. Evidence from anatomy, anthropology, and cultures worldwide reveals practices like partible paternity and sexual autonomy, with humans having sex about 1,000 times per birth, similar to bonobos and chimps. Misunderstanding these roots fuels shame and unrealistic expectations, while embracing them can foster empathy and acceptance.