yes, but! morality isn't just about sex/porn/gay marriage etc. surely morals (and ethics?) covers every kind of behaviour, from legal things such as telling the truth or lying, buying things legit or stealing them/downloading illegally, beating up someone i don't like or just letting them be.
i read an interesting definition of good and evil the other week. it's "what would happen if everyone did it - would it make the world a better place".
if governments used this definition, i wonder what their priorities would be. i imagine they would be interested in every part of people's lives, including their sexuality. but that would be way over the top, 1984 style...
i think really, governments should be concerned with damaging behaviour. i can't see how gay marriage is damaging, and as long as sex and porn are kept safe, i think governments should stay out!