According to the ubiquitous and irrefutable Wikipedia, endorphins are "endogenous opioid polypeptide compounds. They are produced by the pituitary gland and the hypothalamus invertebrates during strenuous exercise, excitement, pain, and orgasm, and they resemble the opiates in their abilities to produce analgesia and a sense of well-being. Endorphins work as "natural pain relievers", whose effects may be enhanced by other medications."
The New York Times cites research by some crafty German scientists who found a way to measure endorphin levels before and after strenuous exercise. The study asserts to prove the existence of runner's high, even claiming that some athletes become addicted to the high.
Seems logical to assume a statistically valid counter correlation between frequent, intense, lengthy exercise and sex. Maybe the crafty scientists could survey marathon runners and fat guys: anyone have a hypothesis on who gets more?
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