Chicken or the Egg? Snoring or Sex-deprived?

Okay, so they've done a study that links snoring to a lack of sex. But what I'm not sure of is which is the cause and which is the effect?

Is it that people who snore have less sex? Or, is it that people who have less sex end up snoring?

I'm not the research scientist on this one, so your guess is as good as mine. And really, there are way too many people in my family who snore to really go too close to this one. You be the judge and read the story here.