Men who are obese may have a lower libido and a less satisfying sex life, according to new research.

Findings published in the Journal of Clinical Endocrinology & Metabolism reveal that obesity is biologically associated with an unsatisfactory sex life.

Previous investigations had linked extra weight to a lower sperm count and infertility. As part of the new study, scientists from the University of Utah followed 64 men over the course of two years, measuring their weight, body mass index and reproductive hormone levels.

“In our study population, we found that lower testosterone levels and diminished ratings for sexual quality of life were correlated with increased body mass index,” explained Dr. Ahmad Hammoud, study leader.

Furthermore, the researchers found subjects who lost weight via bariatric surgery saw their testosterone levels and sexual satisfaction increase.

The results of the research suggest there is an association between hormonal measures and sexual quality of life that is independent of weight, Hammoud added, explaining that further study should help identify a precise cause-and-effect relationship.

Some people find nutritional supplements help them maintain a healthy libido despite other factors affecting their health.