Brian et al. 2013 "Penis size influences male attractiveness"

DOI: 10.1073/pnas.1219361110

被験者：異性愛者のオーストラリア人女性105人。平均年齢26歳

性的魅力を感じる人は誰かという質問

https://gyazo.com/696e0a28c76ec6fa7172aeea55ebc2d9

Positive linear selection was detected for penis size, but the marginal increase in attractiveness eventually declined with greater penis size (i.e., quadratic selection).

上に凸の関数

ただし減少はしてない Fig.2

https://gyazo.com/84da9a9cfb36b07d6a53c37f2bc42761

5-13cmで検証しているので13cm以上に魅力を感じるのかわからない

Penis size had a stronger effect on attractiveness in taller men than in shorter men.

背が高いほうが顕著

There was a similar increase in the positive effect of penis size on attractiveness with a more masculine body shape (i.e., greater shoulder-to-hip ratio).

ペニスサイズが魅力になる正の効果は、男性的な体型（ケツより肩幅がでかい）かどうかに依存しない

Surprisingly, larger penis size and greater height had almost equivalent positive effects on male attractiveness.

身長と同じような効果

ペニスサイズがでかくなるような淘汰があったんじゃないか？と