True, but I actually prefer the argument from design. Because if you take the position you state, the only reason someone shouldn't put a penis in an anus is because it damages the anus. And if the owner of the anus in question doesn't particularly care, and the majority of people don't care deeply about the anuses of this small fraction of the population, then you're done.
And truly... the owners of the anuses don't care, and the rest of the world doesn't much care either, not in those terms. Apart from God and God's purpose you're just talking about so much meat. This meat will one day go the way of all flesh.
Well, I actually don’t care what people do with their anuses per se. It doesn’t harm me, nor is it a sin against me if someone wants to sodomize someone else. What does matter to me is when me or mine are told to shut up, ignore reality, and treat sodomy like it’s something perfectly normal if not admirable. It matters to me when I’m ostracized for stating what’s objectively true or my children are indoctrinated to believe a lie. It also matters to me, because I care about other people as a Christian and really don’t want to see anyone burn in Hell. Therefore, I want to give people an opportunity to hear the truth so that some might be saved. Nevertheless, I respect their right to choose Hell. God certainly does.