Anyone who has ever watched a sitcom knows that new parents are the butt of most sex jokes. While sex (and often times fertility treatments) get couples into the family way, they aren't always quick to hop back in the sack once the lil ones arrive. "Studies have shown that 90 percent of new parents have experienced a decline in relationship satisfaction," said Dr. Ian Kerner, a sex therapist and contributor to GoodinBed.com, as well as the co-author of Love in the Time of Colic ($13). "That’s a big percentage of parents that are happy to be parents, but not happy in their relationships." I spoke with Dr. Kerner about the obstacles new parents face in finding time for one another. Here's what he had to say.