Scientists recruited 38 men diagnosed with hypoactive sexual desire disorder or sexual arousal disorder—two conditions characterized by a lack of interest in sex—and provided bright light treatment to half of them.
For 30 minutes each morning, these men sat in front of a light box that exposed them to 10,000 lux of light. (For comparison, direct sunlight can reach up to 100,000 lux, and a cloudy day is about 1,000 lux.)
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