I think we can agree that what occurs in nature does indeed define what is natural.
Sorry, Logical, but you're essentially using a word to define itself. What
doesn't occur in nature? The supernatural?
Does lightning occur "in nature"? Is fire "natural"? Is kindling? Rubbing sticks together? Matches? My gas stovetop?
A word of caution: take the concept of morality more seriously, even if it may be subjective. Many people on this discussion board maintain that Prop 8 is wrong because it takes away rights. Anytime you use the words "right" or "wrong" you know your working within the concept of morality.
Ouch. Now that's simply a "Logical" fallacy, since you are mixing up two different meanings of the word "right" ("legal entitlements" [plural noun] vs. "correct/good/proper" [noun and adjective]).
"Fighting for your rights" and "fighting for what's right" do
not mean the same thing.
A better challenge to my argument perhaps would have been to offer an alternative reason why we as humans do not engage in sex acts in public rather than to attempt to invalidate morality in general.
We don't engage in sex acts in public?! Logical, you need to get out more. Our society is awash in novels, films, TV shows and songs that are about almost nothing else, and these are all very public. (... and please reassure me that you don't come from the Bill Clinton school of what constitutes a sex act.)
At the end of the day, whatever our worldview is, we are not going to get away from the moral implications when discussing this issue.
I think you're right.