“…First, at the very least, waists and chests are sexual because they differentiate people on the basis of biological sex. For example, eye‐tracker studies confirm that people focus on men and women's waists and chests when they engage in gender categorization (Hewig, Trippe, Hecht, Straube, & Miltner, ; Johnson, Lurye, & Tassinary, ; Johnson & Tassinary, ). Second, although genitalia may be regarded as more explicitly sexual than waists and chests, they are rarely revealed in interactions with other people, and thus, people use secondary (versus primary) sex characteristics, including waists and chests, as proxies for reproductive fitness (Singh, ).…”