Everybody else is linking this article, so I'm going to make like a sheep and follow the herd:
(posted on "The Week," no author byline)
Semen: Nature's antidepressant?
"Semen contains a number of "mood-altering chemicals," says Neetzan Zimmerman at Gawker: Estrone and oxytocin elevate mood, cortisol helps promote affection, serotonin is an antidepressant, and melatonin helps regulate sleep patterns."
Meet your new best friend: