Undoubtedly sex and happiness go hand-in-hand. And nobody needs a scientific explanation for that. But men who think money can buy them more happiness might want to take a look at this. An observational study found that sex gives more happiness than money. It study authors mentions that sex improves happiness quotient so strongly that increasing sexual activity from once a month to once a week makes a person who earns decent amount of money as happy as a person who earns 50000 dollars a month. As far as women are concerned here's something that might interest you as well.