Having experienced times in my life when I had way more sex than I currently do, I have to say that I wasn't any happier. In fact, I'm much more mentally and physically healthy now than then. I'm not suggesting that human touch/companionship and intimacy aren't conducive to happiness and satisfaction. I just don't think that all sex or relationship necessarily equals "Healthy" sex and relationship.
I guess what I'm trying to say is that sex is not a magic bullet, and that real happiness comes from inside. One can be rich, famous and extremely desired and still be miserable....just look at all the celebrity suicides and overdoses.