Well, granted. But in a world in which people assume there's no God, why should anyone care about your particular notions of what's healthy or natural?
It works out to a very good justification of your own choices in the matter, but people will not respect your efforts to apply what they see as your personal standards to their lives... and nor should they, on those terms. It's just a different flavor of the Nanny State.
Oberon: “...why should anyone care about your particular notions of what’s healthy or natural?”
Because my “notions” about what’s healthy or natural aren’t just opinion. Some things are objective fact. Fact: the anus was not designed for intercourse. It’s physically designed to be a one way valve. Fact: homosexual sodomy has a much higher chance of passing disease. It’s an inherently unhealthy act the risks of which can be mitigated with technology but not eliminated. Fact: homosexual sex does not and cannot result in conception. It’s a natural dead end. A colony composed exclusively of homosexuals would die out in one generation. These aren’t subjective opinions. They are measurable, proven, objective facts.