Sacred cow syndrome: "Monogamy is an intrinsically fraught subject. If you and your partner go out for dinner and talk about monogamy, the conversation is likely to get quite difficult. And there's a reason for this. Monogamy seems to me peculiarly difficult to talk about in a way that, as it were, moves the story on or modifies our ideas about it. And this suggests to me that it's a very powerful, quasi-sacred idea."