The positive effect of smile and laughter to the body have been scientifically proven. That must be the reason why men want women who have a sense of humor. "A good laugh and a sweet smile with your girlfriend (or wife) is always healthy and important. It lightens stress, eliminates anger and softens the heart. Good humor is needed in tense moments of the relationship. So women, make it a point to share a laugh with your partners and with your kids and score big points in the relationship.