So his team set up an experiment in which Australian women—averaging 26 years old—each looked at 53 life-size images of various computer-generated male silhouettes projected onto a screen. The gray, homogenous-looking men had different heights, shoulder-to-hip ratios or body shapes , and flaccid-penis lengths. The women in the current study were then asked to rate the men on an attractiveness scale of , with 1 being least attractive and 7 being most attractive. What's more, studies using models of human genitalia have shown that deeper thrusting displaces more semen from a woman's reproductive tract than shallow thrusting. For one, previous studies have shown that "the flaccid human penis is an imperfect indicator of the size of the erect penis," said Gallup, of the State University of New York at Albany, who was not involved in the study. Past psychology studies that have asked women about their preferences for penis size have produced mixed opinions, with some saying they don't care about the size, while others say they prefer larger penises.
Aurelia. Age: 27.
Past psychology studies that have asked women about their preferences for penis size have produced mixed opinions, with some saying they don't care about the size, while others say they prefer larger penises.
Belen. Age: 22.
The Black Man’s Sexuality: A Racist’s Worst Fear
Also see "Sperm Works Best in the Winter. Therefore, "long penises may have also evolved to deposit semen in the deepest and more remote parts of the vagina to promote more effective sperm retention," he said. But evolutionary psychologist Gordon Gallup, Jr. Explore an interactive of the human body.