To deny the role of nature in nature is a clear example of the “ostrich's fallacy”.
The problem here is that the word "natural" has many loaded meanings. It can mean morally good or bad, or it can mean man-made, or it can mean paranormal / not described by physics, or it can mean in concert with a person's interests and inclinations.
The whole argument is based on a word game:
- Having romantic relationships with men or women is by no means restricted by the laws of physics, so its "natural" in that sense.
- Homosexuality certainly isn't man-made anymore than heterosexuality, nevermind that people use all sorts of man-made things in their daily lives all the time, so things being man-made or not is clearly irrelevant.
- People certainly never evolved to live in skyscrapers or to use contraception, so criticizing homosexuality on the basis that it's not an evolved tendency either carries over to every other facet of modern living or is non-sequitor.
- When talking about a person's inclinations and interests (i.e. what "comes naturally" to people), its much natural for gay women to pursue romantic relationships with other women than with men, its natural for straight women to pursue romantic relationships with men than women. Things that "come naturally" to people are relative to their private and personal interests.
So, the only meaning we're left with is "natural = morally good, unnatural = morally bad". The argument "homosexuality is morally wrong because its unnatural" literally means "homosexuality is morally wrong because its morally wrong", its circular, it doesn't explain
why its morally wrong.
That's kind of a problem. You state over and over again that being gay is unnatural without ever explaining what "unnatural" even means, let alone explain what possible moral distinction is between someone having romantic relationships with one gender vs another.
At best, you're confabulating an argument against gay couples. You likely don't give a crap what is or is not natural (whatever you mean by that word), just what you find personally disgusting (presumably gay men, because lesbians are awesome, amirite?). If that's a sufficient reason to deny them of a fundamental right to marry, I will inform you that a majority of Americans are profoundly disgusted by anti-gay prejudice, therefore
you should lose your right to marriage too. Seems to be the "natural" implication of your argument, right?