It may sound too good to be true but the secret of prolonged youth is much simpler than strict dietary regimes and expensive cosmetics, well, thats what some experts would like to believe.They believe that the most effective way to keep your looks, according to the latest comprehensive research, is to maintain an active love life.Couples who make love three times a week look seven years more youthful than their less romantically inclined counterparts, says the study, which interviewed people aged between 18 and 100.So does sex itself really extend our lives or prevent heart attacks?This claim is difficult to prove. Yes, sex and good health are usually linked, - in most of the studies and the expert observations -- but which one is the chicken and which the egg?