Sex is not a sin, in fact we were created to be sexual creatures. God's first command to the human race was "Go forth and multiply, and subdue the Earth."
The sin is actually the abuse of sex, including all forms of adultery (sex outside of marriage), affairs, etc.., -blam!-, beastiality, and (I will ignore the hate for this) same sex relations.
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Well "go forth and multiply" doesn't mean go get married and fu[i]c[/i]k It means go out and fu[i]c[/i]k, so god promoted -blam!- and incest? K
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God had set the standard for what marriage is, and then, it was between only two people, man and wife. And yes, incest had to happen in order for Adam and Eve's children to reproduce. Once enough people had been around that they no longer had to be with immediate family members, God then commanded that no one shall lay with anyone in their family.