I agree that the discussion on sex should change, but I wouldn't try to disconnect the link between pre-marital sex and marital happiness. Sex is as much psychological as it is physical, and being involved in something so emotionally charge without commitment, understanding, or respect can lead to serious psychological scares, which in turn will move with that person into any marriage they ever have. Questions of fidelity, trust, honor and respect will permeate the marriage. In marriage, doubting these things leads to unhappiness. I know this is true. I've seen it over and over again. So I would caution that we not discount the link between premarital sex and marital happiness, if by doing so we undermine our own efforts to educate and guide or children towards happiness.