Christopher Ryan argues that we are hardwired to crave novelty, which leads to infidelity in marriages. Ryan says the way that culture responds to this “natural behavior” causes more problems than it solves. In other words, sex isn’t such a big deal, so why do we let it get in the way of all the other important things? The point of marriage is to grow old with someone and develop a sense of trust. Therefore, Ryan argues we need to take a “harm reduction approach” over an “absolutist approach.” That means that marriage needs to adapt to the realities of human nature.