All the things God calls sin have a detrimental impact to the individual and to the society. This is one way, I find, to identify if something is sinful when the Bible is less than clear, as it sometimes is.

Further, sin is always evil. How could it be anything else? God is the basis of moral good. Good doesn't describe God, God describes good. As such, sin is the antithesis of God and is therefore evil.

There is no Biblical basis for differentiating between sin and evil. Sin is to miss the mark. God's Word is the mark. God's Word is perfect and good. To miss that mark would mean to be imperfect and not good. If something is not good, it is evil, as it is not of God who is the very concept of good.

Maybe instead of making snide and snarky comments like "learn it" while exuding an air of superiority while accusing people of acting better than others, you could actually present your view on sin vs evil? Revolutionary idea, I know...

As for consenting adults, they can have their gay butt sex in their own beds. They don't need to be parading around in public acting like they're so amazing for putting their dicks in ass or for cutting their dicks off.