Many here seem to be unable to put their finger on why it is perverse other than because they inherently ‘believe’ it should be. So this is my opinion.
Every action in the world has some good that can possibly result. Marriage between man and woman is sacred because although there is desire involved, there is also a higher purpose as there is a potential to create something. Same-sex marriage, on the other hand is perverse – and similar to rape/incest/bestiality – because it is desire for the sole means of acting on desire. Being openly gay is a public expression that one views himself foremost as a physical being as there is nothing positive that can come from same gender relations.
Jf: what you say about roommates – if they want to announce their love for each other, they can buy BFF necklaces and wear them every day. It’s quite different to believe that they should get marriage benefits because of their love. Marriage is a step toward creating a family – creating our (all of mankind’s) future – which is why it makes sense for the government to grant those benefits. (So gays can adopt…I hear)
All that being said, no one is denying their feelings for each other much like one can’t argue with an engaged couple that the feelings aren’t real as ‘true love only comes after marriage’. Instead, my contention is the following: I believe it is perverse because 1) it belittles marriage in general by saying it marriage is nothing more than an expression of love rather than a sacred union, and 2) it is announcing to the world without leaving any room for doubt that ‘I don’t think through through my brain but rather through what will offer me more pleasure’.