The Bible, it's hilarious!
Genesis 38:9-10: "Onan knew that the offspring would not be his; so when he went in to his brother's wife, he wasted his seed on the ground in order not to give offspring to his brother. But what he did was displeasing in the sight of the Lord; so He took his life also."
Leviticus 19:28 reads, "You shall not make any cuts in your body for the dead nor make any tattoo marks on yourselves: I am the Lord."
Leviticus 19:19 reads, "You are to keep My statutes. You shall not breed together two kinds of your cattle; you shall not sow your field with two kinds of seed, nor wear a garment upon you of two kinds of material mixed together."
Check the tag on your shirt right now. Didn't realize you were mid-sin at this exact second, did you? (Unless you checked the tag by rolling off your neighbor's wife while you two were having anal sex in the middle of robbing a blind guy. Then your Lycra-spandex blend is really the least of your problems.)
Mark 10:8, you "are no longer two, but one flesh." And, Mark 10:9 reads, "What therefore God has joined together, let no man separate."
Mark gets even more hardcore about it a few verses later, in Mark 10:11-12, "And He said to them, 'Whoever divorces his wife and marries another woman commits adultery against her; and if she herself divorces her husband and marries another man, she is committing adultery.'"
Deuteronomy 23:1 reads (this is the God's Word translation, which spells it out better), "A man whose testicles are crushed or whose penis is cut off may never join the assembly of the Lord."
Deuteronomy 23:2 reads, "No one of illegitimate birth shall enter the assembly of the Lord; none of his descendants, even to the tenth generation, shall enter the assembly of the Lord.
Deuteronomy 25:11-12. "If two men, a man and his countryman, are struggling together, and the wife of one comes near to deliver her husband from the hand of the one who is striking him, and puts out her hand and seizes his genitals, then you shall cut off her hand; you shall not show pity."