No one denies that sex is a private matter. That’s why we’re not talking about making sodomy illegal. We’re just saying it’s wrong.
As for “the results being the same”, that’s not the point at all. If a lesbian uses a turkey baster to become pregnant, the results are the same as in marriage – that doesn’t make it OK.
You did not respond to the central point I was making, so let me put it in the form of a question. Since anal sex / oral sex is not procreative sex, please tell me what good it promotes? Unity? Pleasure?
If the goal is unity, then loving same-sex couples can claim that their sodomy promotes unity too, so it should be allowed.
If the goal is pleasure, then loving same-sex couples can claim that their sodomy is pleasurable too, so it should be allowed.
In the end, whatever justifies marital sodomy can be used to justify non-marital sodomy.