Donna Leon said this quote
“ ..if you put people on a diet, they start thinking about food. Or if you make someone stop smoking, all they think about is cigarettes. It seems logical enough to me that if you tell a person he can't have sex, he's going to be obsessive about the subject. Then to give him the power to tell other people how to run their sex lives, well, that's just asking for trouble. In a way, it's like having a blind person teach Art History, isn't it? ”