Why is bisexuality not a recipe for infidelity?Because one of the goals of gay marriage proponents is to also open up "marriage" to multiple partners.
As the author says earlier in the article, once you redefine marriage beyond "one man one woman" how to you stop the redefining.
The answer is: you don't.
Once gay marriage is legal, polygamy will be next.
And I'm sure the islamists would be happy to have their marriages to 8 and 12 year old girls recognized by the US as well.