The Big Male Nose (IMAGE) University of Iowa Caption Male noses grow disproportionately larger than female noses beginning at puberty, a University of Iowa study has found. The reason: males need to breathe in more oxygen to feed muscle mass than females. Credit College of Dentistry, University of Iowa Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.