In chapter 3 Bell takes on the challenge of living in the tension of honsety in regards to sexuality. He talks about the 'animal' side, where people just give into anything or live in a sexual despair. He also talks about the 'angel' side, where people deny any attractive feelings and completely abandon intimacy.
Both of these extremes, according to Bell, take us out of our natural way - being human (not animal or angel). He does a great job at tying it all in together at the end and making it concise, clear and engaging. Probably the best chapter yet.