via Joshua Harris / Instagram

In 1997, at just 21 years old, Joshua Harris wrote the Christian book, "I Kissed Dating Goodbye," which instantly made him a leader in the "purity" movement.

At the time, he was a virgin who had been home-schooled his entire life.

His book claimed that dating was a "training ground for divorce" and discouraged teenage relationships in favor of "courting." It also encouraged parental involvement in relationships and forbade any kind of physical intimacy.

The book instilled suspicion about relationships in young people and caused many to marry the first person they "courted." It also promoted the idea that sex was wrong and impure.

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