Sex-deprived male fruit flies drink more — Human relevance

In experiments seeking to understand the root causes of human addiction, UCSF scientists have discovered that male fruit flies turn to alcohol when female flies reject their sexual advances.

The research team attributed the behavior to a widely known chemical in the brains of male fruit flies called neuropeptide F, which the scientists found varies in brain levels depending on the degree of the males’ success - or rejection - when seeking sex.

The human brain carries a chemical similar to neuropeptide F, which is called neuropeptide Y.
http://sfgate.com/cgi-bin/article.cgi?f=/c/a/2012/03/17/BA9V1NKN8J.DTL