Photo by whemak on Freeimages.com The Yo-Yo of Desire: When Couples Just Aren’t in Sync Ah, relationships! A delicate blend of compromise, patience, and, let’s be real, sometimes an exhausting tug-of-war. If you’re in a couple where sexual desire levels differ, then you’re surely familiar with the “yo-yo” dynamic: sometimes one person’s ready to go, while the other just wants