It's a vicious circle. If you feel hideous, you convey it to people. A couple of male friends from university have said, 'I quite fancied you, but I wouldn't have dared...' and I was like, 'Oh really?' I was completely amazed that anyone had ever fancied me, and also that I'd obviously given an impression of 'Don't touch me.'
The part that always shocked me was the inter-community violence among the chimps: the patrols and the vicious attacks on strangers that lead to death. It's an unfortunate parallel to human behavior - they have a dark side just as we do. We have less excuse, because we can deliberate, so I believe only we are capable of true calculated evil.