According to WebMD, the key to health could be exercising your libido. A recent article on the website reports instances of people losing weight and mitigating anxiety by hopping in the sack. Kerry McCloskey, the author of Ultimate Sex Diet, says that "because sex is a mood enhancer; the more you have it, the more endorphins that are released." Endorphins are the brain's feel-good chemicals. She recommends having sex three to five times per week, and according to her records, sex burns 150 to 250 calories per half-hour.
"Since it's free and so much fun, I've found making love is the ultimate exercise machine." Amen to that!
...I find this advice less than useful. I don't always have a real, live lover stashed away in my closet for easy access. While I don't doubt that sex can be good for you, I also presume that it has to be good sex, and not the dull and boring kind...or worse, the downright physically painful kind. Also, just because you have one partner doesn't mean you are safe. The friends of mine who caught STDs (notably herpes) caught them from serious boyfriends they weren't using condoms with but trusted. Even having sex with a marriage partner isn't 100% "safe" what with infidelity. Not to be a downer on sex - sex can be great! But it's not a panacea.
I think having a healthy libido is important, but when sex becomes a routine, mechanical thing that you feel you SHOULD be doing, that's a problem. I thought the story was kind of funny but I also think it's part of this really formulaic attempt to spread "wow, sex is great and good and fun!" awareness to the masses.
Also, I think we're so stuck on having fun and feeling warm fuzzies all the time that it makes sense to me people would start touting the therapeutic values of sex. But I am in agreement with Stephanie--it's not a panacea for everything, and news flash, it isn't always fun, especially if you're not in the mood (which is okay).
Honestly, I've found that meditation has improved my health demonstrably, but it's not about getting the serotonin flying or getting down and dirty--but I don't think it's any less valid a technique.