Testosterone is essential for the regulation of erectile physiology, but the relationship between low testosterone and erectile dysfunction (ED) has not been firmly established.
Lu, Z., Zhang, Y., Tan, A., Yang, X., Huang, X., Liao, M., … Zhang, H. (2012). Testosterone Is Associated with Erectile Dysfunction: A Cross-Sectional Study in Chinese Men. PLoS ONE. https://doi.org/10.1371/journal.pone.0039234