Religious morals

Why is it some christians regard sex as a sin (temptations of the flesh!) when in both testaments man is encouraged to be fruitful and multiply?

Marriage, I beleive.

Where does it say that sex-in-itself is a sin? Doesn’t it tend to be sex outside of wedlock, as TheQuestion states.

Ha Ha Ha… this is tooo good!

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The institution of Marriage was created by God for just this single act alone. This truly signifies its importance in the Face of Our Creator.

You would do well not to intentionally twist it.