Nor have you demonstrated, in any reasonable way, how non-procreative sex somehow "impedes" sex-for-procreation. Neither did the defenders of California's Prop 8; in fact, they spectacularly failed to prove that SSM caused any harm whatsoever to opposite-sex marriage.
I believe universal ethics can be developed. However, I reject the idea that "sex must be for procreation" or "thou shalt not impede a natural end" are valid universal maxims. Nor do I see any necessity for such a claim.So it is your opinion that morality is not objective?
Or, to turn this around: Are you actually saying that it is immoral for a healthy adult to consciously choose not to reproduce? And if so, why shouldn't the state be empowered to compel me to have a child?