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As a Catholic, I know that the Catechism of the Catholic Church clearly states that premarital sex (fornication is the term they use) is gravely sinful. It would certainly earn me a trip to the confessional!
I do think, though, that sexual sins are singled out too often. There are several other sins mentioned in the Letter to the Galatians that don't receive as much attention, and are equally as damning, such as jealousy, anger, selfishness and envy.
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