Does this extend to women with masculine traits and features in general? What about a tomboy swagger or mouth like a sailor? Do masculine traits in general make the male internal red flag wave?
Well, not exactly. This study is pretty ardent in how it only pinpoints the face.
"Results suggest that information about women’s sexual unrestrictedness, which is related to their risk of infidelity, can potentially be conveyed by the masculinity of women’s faces," wrote Dr Lorne Campbell, one of the research psychologists. "The research is the first to our knowledge to suggest that a more masculine facial appearance in women might convey their sexual unrestrictedness and perhaps their long-term mate quality."