What's wrong with a good old-fashioned marriage of one guy and 50 to 100 women?
Actually, there is far more historical precedent for polygamy than there is for same-sex marriage.
Possibly because CATO is a bureaucracy, and all such have the same tendencies. Whether it's government or private, big groups of people who think but not do, get strange ideas, and then tend to be liberal ideas. Maybe because doers see how hard it is to get things working in the first place, that they are not so ready to break things that are working.
Libertarianism appears to suffer from the same concept of pure thought/revealed wisdom that inflicts Marxists.