The Stated Purpose
The Duggars believe that all premarital physical contact is inherently sinful. When asked how they came to this view, they tell outsiders that they believe passages in the Old Testament indicate that sex is to take place only between husbands and wives, and solely for the purpose of procreation.
The Actual Purpose
However, the language that members of the Quiverfull movement use with one another reveals a far more sinister intention: The Duggars and their ilk seek to neutralize the threat they feel is posed by female sexuality.
This agenda is reflected in the terminology used in IBLP teaching materials. For example, women who dress in provocative clothing are condemned for "defrauding" their male counterparts--that is, “stirring up desires that cannot be righteously fulfilled.”
A Dangerous Belief
Yes, in 2017, people like the Duggars are teaching their children that sexual assault is often the victim's fault. It's likely for this reason that parents Jim Bob and Michelle saw fit to protect Josh from prosecution after learning that he'd molested his sisters.
By now, you're probably beginning to realize that the Duggars' courtship rules are more dangerous and nefarious than they may seem at first sight. But what do the rules consist of exactly? Here's a rundown, as explained by Jim Bob and Michelle, during their 2014 (pre-sex scandal) interview with Today:
"Dating With a Purpose"
That's the way Jim Bob describes courting, and he instructs his children to think of it in those terms. “Courtship is really waiting for the one God has for you and praying through the whole process,” he tells Today. “It’s really examining the person and considering, ‘Would this be the guy I want to be the father of my kids?’”