Evolution selected for "likes sex" because that was a good proxy for "wants kids". Some new proxy will take place of the old, or we'll be more directly selecte

Evolution selected for "likes sex" because that was a good proxy for "wants kids". Some new proxy will take place of the old, or we'll be more directly selected based on a "wants kids" desire. Given the huge world population, the needed trait likely exists. In time, it will become near-universal.