You may want to look into the principles of common and natural law... Pretty much every law in the common law system, including the constitution, is a law that

You may want to look into the principles of common and natural law... Pretty much every law in the common law system, including the constitution, is a law that denies rights to subsets of the population. The only question is whether you are in favor of such regulation. I'm personally not in favor of regulating homosexuality or marriage.