Tonight, when you go to bed, don't just roll over. Face your partner. Look at them. Lean in. Make that first kiss count. It takes only six seconds to change your brain chemistry. It takes a lifetime to master the art of being a .

Over time, bills, kids, and fatigue buried that electricity. But it is still there, just beneath the surface.

It lasted maybe eight seconds. Ten, tops.

Though the term is modern, the behavior is ancient. Consider "M and J," married for 22 years: