Hormones tend to work behind the curtain, yet they choreograph much of human intimacy. Among the full cast, testosterone and estrogen serve as co‑captains, steering both the mental spark of desire and the physical comfort that turns interest into action. Testosterone: Lighting The Spark Men: When total testosterone falls below roughly 300 ng/dL, clinical studies record fewer spontaneous erections and a steep drop in sexual thoughts. Restoring levels to a healthy mid‑range has been shown to improve standardized libido scores significantly in numerous studies. Women: Concentrations are far lower, but higher mid‑life testosterone and DHEA‑S still link to more frequent
