I agree that fornication, pre-marital and extra-marital sex is sin, too. As well as homosexuality.
Try telling that to the far left in this country, though.
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Man #1:
"Human relationships are the most important, most fulfilling thing in the world. Not to mention the most gratifying."
Man #2:
"No they are not either. A man's relationship with God is the most important, most fulfilling, most gratifying thing in the world."