A cross-sectional analysis of 434 men aged 50–86 years found a marked increase in low libido when serum testosterone levels dropped below approximately 15 nmol/L (~433 ng/dL). The findings underscore testosterone’s critical role in maintaining sexual desire, particularly in older hypogonadal men. The study also notes that restoring testosterone—potentially alongside PDE-5 inhibitors—can meaningfully improve erectile function for those with documented deficiencies.
The Impact of Testosterone on Erectile Function
