7 Things you must know about other couples' love: we're all curious about what goes on in our friends' relationships. But Cosmo discovered that a twosome's public image is often deceptive. Once you read this, you won't ever suffer from grass-is-greener syndrome again

You see another couple and you can't help it: You wonder things, like what their sex life is like, how they act at home, and if they're really that in [...]