I think it's pretty obvious that monogamy isn't built into human nature, but I object to the post pretty vehemently. Do you have any examples of vehement objections by people who insist that polyamory is 'bad' as opposed to by people who think that bad reasoning is 'bad'?

I even said I planned to read the book some day, as it sounded interesting but badly reasoned. However, a short summary of an interesting but badly reasoned book, when the summary itself doesn't comment on the bad reasoning but instead endorses said reasoning, on a rationality blog, seems to indicate to me that the author of the summary needs more practice before they can talk rationally about the subject.