It’s too late for this now, but VIP commenter chris made an outstanding bio-logician’s case against gay marriage.

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A rational, non-bigoted argument against gay marriage.

Part I
The thing which worries me about gay marriage is that the norms surrounding gay long-term relationships will be imported into the concept of marriage.

http://www.sfgate.com/lgbt/article/Many-gay-couples-negotiate-open-relationships-3241624.php

(The above is a media write-up of a study that found that in a study of 566 gay couples, only 45 percent had made the promise to be sexually monogamous. This is an example of a different moral norm surrounding gay long-term relationships.)

http://www.nytimes.com/2010/01/29/us/29sfmetro.html?_r=1

(In the above link is a NYTimes piece arguing that homosexual marriage could modernise (that is import different norms into) marriage as an institution.), specifically; “The traditional American marriage is in crisis, and we need insight,” he said, citing the fresh perspective gay couples bring to matrimony. “If innovation in marriage is going…