Sex, we have been led to believe, is as natural as breathing. But in fact, contends British philosopher Alain de Botton, it is “close to rocket science in complexity.” It’s not only a powerful force, it’s often contrary to many other things we care about. Sex inherently sets up conflicts within us. We crave sex with people we don’t know or love. It makes us want to do things that seem immoral or degrading, like slapping someone or being tied up. We feel awkward asking the people we love for the sex acts we really want.