Hmmm.... Let me see.....stuff that is important.
If man is created for the potential of autonomously chosen pursuit, obedience, and worship of He who created him, then the quality we call sin is perhaps not best argued at the level of "don't do that or this". Sin (capitalized not just because it begins the sentence) is all about your personal theory of governance. The question "who is in charge here?" asked of just about everyone is easily answered by the casual tapping of their own chest. Another question comes charging up. "How is that working out for you?" Admit it, you are lousy at Life. You are not smart enough and neither is Dr. Phil. Oh yeah... and then you die. Dumb as a stump and worm feed ere long. God has given you feelings and perceptions and hopes and fears punctuated by mortal and immortal death. With that lineup He expects you would consider taking His resume, looking over His qualities for running the job to which you promoted yourself. Allowing that God is the wisest guide, Righteousness is the wisest governance of all pains and pleasures. Sin will actually be the governance that follows, not wisdom, but the folly of urge. Run to pleasure (be it drink, sex, etc.), retreat from pain (fear, cowardice, dishonesty, etc.) and nothing has governed, nothing has ruled but passion, wanting what promotes itself in Desire. To want without will is not just evil but bestial as well. The Christian, living in the light of God's governance is not just holy but humane.
Let me give you some help.
Sin is not a pattern of icky crimes but shallow ones. It is not the biology of sex that makes it bad in various circumstances but the variety of the circumstance. In fact folks are pleased with being taboo or seamy or sordid about their sin. Only a grade schooler will fall for the "icky" spit swapping barrier to kissing. Who shall I blame for this error in assessment? The church will do just fine. Augustine held that sex was even sinful in marriage. John Paul II suggested that lust was wrong even within marriage. They and their ilk built and sustained the Manichean Icky School of Sin and the sinner is oddly happy to graduate from it. Pleasure can trump icky in a heartbeat, in fact icky makes sin more pleasing still. But Sin is not the icky. Sin is the white trash level of confidence that you are capable to rule the monstrous joy of sex. A man looks a woman not his wife, or the teens park the car at the scenic overlook, or the pederast cruises the chat rooms, and each will say (to maintain the metaphor of how trashy are your choices) "Here, hold my beer and watch this."