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Sexual selection, through female mate choice and male-male competition, is a likely driver, but confirming this is difficult due to natural covariation among traits. The solution is to experimentally manipulate focal traits to identify targets of selection. Using 343 computer-generated male figures that varied in penis size, height and body shape, we experimentally tested how these traits influence perceived attractiveness and fighting ability. Over 800 participants\u2014both male and female\u2014viewed either life-sized (in-person) or scaled (online) animations and rated the figures. Across both settings, selection analyses revealed consistent directional selection favoring taller men with a more V-shaped body and a larger penis. In both surveys, male participants rated rivals with a larger penis as more sexually competitive and physically threatening. To our knowledge, this is the first experimental evidence that males assess rivals\u2019 fighting ability and attractiveness to females based partly on a rival\u2019s penis size. Our findings suggest that female choice and male-male competition have jointly favored larger penis size, greater height, and more V-shaped bodies in men.<\/jats:p>","DOI":"10.1371\/journal.pbio.3003595","type":"journal-article","created":{"date-parts":[[2026,1,22]],"date-time":"2026-01-22T18:21:46Z","timestamp":1769106106000},"page":"e3003595","update-policy":"https:\/\/doi.org\/10.1371\/journal.pbio.corrections_policy","source":"Crossref","is-referenced-by-count":4,"title":["Experimental evidence that penis size, height, and body shape influence assessment of male sexual attractiveness and fighting ability in humans"],"prefix":"10.1371","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2576-0922","authenticated-orcid":true,"given":"Upama","family":"Aich","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chloe","family":"Tan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rebecca","family":"Bathgate","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Khandis R.","family":"Blake","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert C. 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