May be it is legal..i don't know but surely it is immoral act in the society and even shameful..
Marriage is a holy..moral and acceptable institution instituted by God Himself to bring-forth off-springs and to be blessed as mentioned in the Holy Bible whether you believe / accept or not, it does not matter what the rest of the world believe or accept.
Gay-ism and Lesbians are polluting the society..They should be discouraged and not acceptable by any means..!!!