8 AM
As both sexes get ready for the day, levels of the stress hormone cortisol rise to help them wake up -and dampen the effect of sex hormones. Cortisol, studies show, lowers the sex drive of both men and women.
As the day goes on, men steadily make testosterone. The hormone is needed to trigger muscle growth and sperm production. Levels will fall and rise every 90 minutes through the day as part of the body’s in-built clock.
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