Being in a long-term relationship is pretty awesome. No more first-date jitters, awkward parent meetings--or running to the coffee shop two blocks from his place to poop. But eventually, the brain chemicals responsible for the exciting honeymoon phase fade, turning things ho-hum, says Greg Kuhlman, Ph.D., director of the mental-health counseling program at Brooklyn College. Welcome news: Experts have found specific (quirky!) ways to get those fun-boosting brain juices flowing again.