get firsky as the weather gets warmer

After spending nearly two decades in school, we're conditioned to look for play in December. And leaving behind that cooped-up, cabin-fever attitude triggers a carefree, ready-for-anything mind-set that stokes the relationship fires.

"Keeping each other guessing increases the production of dopamine, a hormone associated with excitement and anticipation that makes couples feel more sexually attracted to each other," says Scott Haltzman, author of The Secrets of Happily Married Women.