A couple interesting points in the cited study.
From Menshealth: Evolution of Penis Size by Brian Mautz (edited):
"One theory is that girls simply prefer a well-hung guy. In a 2013 Australian study, researchers had women view life-sized, computer-generated images of men with various body types and flaccid penis length. As it turns out, the ladies generally rated the better-endowed guys as better-looking. “Before we were wearing clothes, this is one way women could have judged a man’s attractiveness,” says study author Brian Mautz, Ph.D.
But why would our female ancestors who mated with increasingly larger schlongs over the course of human evolution want a bigger penis in the first place? Even modern woman’s preference for a big penis is uneven. “Although women saw a larger penis as more attractive on average, there are women who have no preference at all,” says Mautz.
Mautz’s study even found that having broad shoulders was a better predictor of attractiveness than penis size, and taller men were universally found more handsome. It’s possible women just prefer guys with athletic builds, and a proportionally sized penis is simply along for the ride.
At the same time, a larger penis may help women achieve vaginal orgasm, as opposed to orgasms from the clitoris. Scottish researchers found that out of more than 300 women, about half experienced vaginal orgasms in a month, and one third of those ladies preferred guys who could reach deeper inside during intercourse. The catch: The gals who favored longer shafts had experienced more orgasms in the previous month than all the other women studied.
The same may also be true for women who experience clitoral orgasms: In a study at the University of Texas, 90 percent of women said a thicker penis was more important than length when it came to their sexual satisfaction.
So as long as the woman in your life is happy—and 85 percent of women like their man’s package just fine, says a California State University study—take heart in knowing what really separates us from apes: Our massive genitals."
In summary: Women who were shown "life-sized, computer-generated images of men with various body types and flaccid penis length. . . generally rated the better-endowed guys as better-looking."
"But why would our female ancestors. . . want a bigger penis in the first place?" "A larger penis may help women achieve vaginal orgasm, as opposed to orgasms from the clitoris. Scottish researchers found that out of more than 300 women, about half experienced vaginal orgasms in a month, and one third of those ladies preferred guys who could reach deeper inside during intercourse. The catch: The gals who favored longer shafts had experienced more orgasms in the previous month than all the other women studied.
"The same may also be true for women who experience clitoral orgasms: In a study at the University of Texas, 90 percent of women said a thicker penis was more important than length when it came to their sexual satisfaction."
There seems to be a not-so-hidden assumption here that longer and thicker cocks are definitely better at providing female vaginal and clitoral orgasms. Good news for the well endowed. Not the greatest news for guys like me who are hung like chipmunks. Luckily, I have broad shoulders.