Those of us who enjoy spanking (also known as This Thing We Do, or TTWD)--doesn't matter whether we're giving or receiving--have always believed a couple of things:
1. Spanking your partner (or being spanked) is good stress relief.......and,
2. The couple that "plays" together, stays together.
Now it turns out that we really did know what we're talking about. Check out this link to an article on the site New Scientist--
I especially like the picture they included with the article. By that, I don't mean it's a good picture--there's a lot of things wrong with it, in fact (that's a horrible implement to use in an OTK situation, plus the spankee should be facing the other way--I'm not a big fan of trying to spank across the body like that. And, since I'm a Spanker who prefers M/F, I could also say that the roles should be reversed.) :-)
Mostly, I just give them credit for trying. They could have left the article unillustrated. This at least gives you something else to look at, and I dare say even lends a little humor to the article.