David G. Blanchflower, Andrew J. Oswald. Money, Sex, and Happiness: An
Empirical Study. NBER Working Paper No. w10499
Issued in May 2004
Another version can be found at
http://www.dartmouth.edu/~blnchflr/papers/sentScanJEsexmoneyhappinessj
une2003.pdf
This paper studies the links between income,
pooled cross-section equations in which it is not possible to correct for
the endogeneity of sexual activity. The statistical results should be
treated cautiously
Right, chicken and egg... because we happy people tend to attract and have
significantly more sex than the grumpy ones. :-)