causality bites, #371

From CNN.com: "Sex can make you look younger, too, according to neuropsychologist David Weeks, who found that men and women who reported having sex an average of four times per week looked approximately 10 years younger than they really were."

I know, I know, I should stop feeling annoyance anew when a press account of some cross-sectional correlation interprets it in the more appealing direction instead of the more plausible direction. Really, which of the following seems more likely:

(A) Having sex four times a week is so salutary for one's health that it causes one to look a decade younger than one actually is.

(B) People who look a decade younger than they actually are substantially more sexually active than they are.