http://www.newscientist.com/news/news.jsp?id=ns99992457
Semen acts as an anti-depressant
there are other sites that theorize that women are happier when exposed to semen, either vaginally, orally or anally.
There are enzymes in semen that are produced by the prostrate gland and are only found in male semen. it could be these enzymes that the woman needs/craves
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