It isn't that Women's Boobs Control Health, Wealth, and Earthquakes. I know, shocking. Try to control your disappointment.
It's that sexual stimulation is good for the circulation (and probably some endorphin release, too, IMO), not really that staring at boobs will extend your life. The study just reads that way.
Betcha $5 the same study of gay men would have different results.
This does, however, lay the foundation for an argument, I think, that the world really would be a better place if everyone got some every morning.