Penises: The Bigger the Better?

Female preference may have driven the evolution of human males’ relatively large genitalia.

Written byKate Yandell
| 2 min read

Register for free to listen to this article
Listen with Speechify
0:00
2:00
Share

Researchers asked women to judge computer-generated images of men.MAUTZ ET AL., FIG. 1Women rate images of men more highly the larger their penises are, according to a study published yesterday (April 8) in the Proceedings of the National Academy of Sciences. Penis size had about the same influence as height in determining how females rated the attractiveness of males. Body shape was also influential in determining hotness—men with broad shoulders and narrow hips faired best.

Researchers had 105 heterosexual female Australian women rate life-size computer-generated images of men of various heights, builds, and penis sizes. They found that, at rather short lengths, adding inches to penis size was hugely helpful, but the benefit per added inch began to diminish when penises reached around 3 inches long when flaccid. The researchers, from three Australian universities, predicted that there would be a size at which penises became too big but said that they had not studied big enough penises to reach that point. The longest penises they tested were around 5 inches long. Also, having a big penis boosted tall men’s ratings more than it boosted short men’s ratings.

The scientists said that women’s apparent interest in penis size could explain why ...

Interested in reading more?

Become a Member of

The Scientist Logo
Receive full access to more than 35 years of archives, as well as TS Digest, digital editions of The Scientist, feature stories, and much more!
Already a member? Login Here

Related Topics

Meet the Author

Share
February 2026

A Stubborn Gene, a Failed Experiment, and a New Path

When experiments refuse to cooperate, you try again and again. For Rafael Najmanovich, the setbacks ultimately pushed him in a new direction.

View this Issue
Human-Relevant In Vitro Models Enable Predictive Drug Discovery

Advancing Drug Discovery with Complex Human In Vitro Models

Stemcell Technologies
Redefining Immunology Through Advanced Technologies

Redefining Immunology Through Advanced Technologies

Ensuring Regulatory Compliance in AAV Manufacturing with Analytical Ultracentrifugation

Ensuring Regulatory Compliance in AAV Manufacturing with Analytical Ultracentrifugation

Beckman Coulter Logo
Conceptual multicolored vector image of cancer research, depicting various biomedical approaches to cancer therapy

Maximizing Cancer Research Model Systems

bioxcell

Products

Sino Biological Logo

Sino Biological Pioneers Life Sciences Innovation with High-Quality Bioreagents on Inside Business Today with Bill and Guiliana Rancic

Sino Biological Logo

Sino Biological Expands Research Reagent Portfolio to Support Global Nipah Virus Vaccine and Diagnostic Development

Beckman Coulter

Beckman Coulter Life Sciences Partners with Automata to Accelerate AI-Ready Laboratory Automation

Refeyn logo

Refeyn named in the Sunday Times 100 Tech list of the UK’s fastest-growing technology companies