There is a war within me. And as any of you who have ever tried to drive a faulty car or operate a faulty computer will know, once some of the parts start to become fragmented or distorted, the system doesn't work properly and the longer you run it like that the worse it gets. It's the same with your body. There's nothing inherently wrong with the human body, but you could have the best body in the world, and if it's not properly integrated with your mind, your spirit, your emotions, your values, it is just as likely to run out of synch with them and even war against them. C.S.Lewis once said that there is no such thing as a pure evil.
All evils are just distortions of things that are good.
Hatred is a distortion of love. Lust is a distortion of passionate desire. Pride is a distortion of self-esteem. There is nothing wrong with bodily desires until they become distorted or fragmented off from their proper relationship with other aspects of you. Now we'll use sex as our illustration here for a minute.