Kontula Osmo, Väisälä Leena
Väestöliiton väestöntutkimuslaitos Helsinki.
Duodecim. 2013;129(13):1375-8.
Sexual desire involves many different things such as sexual thoughts and images, excitement, expectation and orgasm. Mood has a strong association with sexual desire. Fatigue and depression in particular cause lack of sexual desire. By affecting the state of alertness and energy in humans, sunlight may increase sexual activity.
性欲涉及许多不同的方面，如性想法、性意象、兴奋感、期待和性高潮。情绪与性欲密切相关。尤其是疲劳和抑郁会导致性欲缺乏。阳光可能通过影响人类的警觉性和精力状态来增加性活动。
