Many commentator have pointed out the hypocrisy of Christian leaders who claim a moral high ground while supporting President Donald Trump. The latest scandal involving an alleged extramarital affair with pornographic film star Stormy Daniels proves no exception.

The Christian right that supports Trump has found ways to justify their support of the president, for example, with analogies of how God used King David, a man with personal flaws, for the greater good of the country.

All the while, however, evangelical leaders remain definitively opposed to pornography. In the words of an evangelical celebrity and outspoken opponent of pornography, Josh McDowell, it is “probably the greatest problem or threat to the Christian faith in the history of the world.”

As a sociologist who studies how evangelicals talk about sex, I see evangelical Trump supporters’ reaction to the latest Stormy Daniels scandal as fitting right into how evangelical Christians have responded to pornography in recent history.

The Christian anti-pornography movement

Christian opposition to pornography has long been connected to larger efforts to impose Protestant morality onto American politics and culture. Sociologist Joseph Gusfield would call it a “symbolic crusade” – which is less about porn per se and more about broader social concerns over changing gender roles, sexual norms and family life.

Long before the Christian right emerged in the 1970s and 1980s, for example, Billy James Hargis an evangelical preacher and radio host, warned that pornography encouraged the spread of communism. Hargis first gained national attention in the 1950s for preaching against communism in his radio program “Christian Crusade.” He was convinced that homosexuality, sex education and pornographers fueled a communist-friendly moral decay.

Later in the 1980s, evangelical Protestants mobilized against the sexual revolution of the 1970s. One of their targets was the pornography industry that had grown with the invention of the VCR and led to pornographic videos entering American homes.

Along with other anti-pornography organizations, the fundamentalist Protestant political organization, the Moral Majority, supported efforts to enforce and increase obscenity laws to regulate and reduce pornography.

The Moral Majority’s platform linked pornography with their other concerns, suggesting that pornography, just like homosexuality or abortion, contributed to the moral decline of America.

More recently, evangelical and Latter-day Saints or Mormon politicians have been urging states across the country to pass resolutions declaring pornography to be “a public health crisis.”

All these political efforts sent a straightforward message: Porn is bad.

Evangelical self-help and sex advice

But the story is not so simple. In the 1970s, an evangelical self-help and sex-advice industry emerged that put a religious twist on a cultural obsession with personal and relationship satisfaction and happiness.

At the time, authors like conservative political activists Tim and Beverly LaHaye and Focus on the Family founder James Dobson acknowledged that porn was a problem that Christians (almost always men but on occasion women) faced. Their writing focused on how pornography harmed marital relationships and personal well-being. At the same time, however, it described how devout Christians may be pornography consumers.

While clearly opposing the consumption of porn, self-help and sex advice book authors also normalized it. In their book, “Pure Eyes: A Man’s Guide to Sexual Integrity,” evangelical writers Craig Gross (also founder of the anti-porn website XXX Church) and Steven Luff asked their readers directly,

“Are you ready to admit … that you struggle with something that almost any man could be tempted by?”

How evangelicals relate to porn

Today, there are evangelical books, websites, conferences and small groups to support evangelicals who are troubled by their own pornography use.

Such resources describe pornography as potentially “addictive” and a ubiquitous temptation in our technology-driven world. Indeed, as sociologist Samuel Perry finds, even conservative Protestants who believe pornography is “always morally wrong” are only “somewhat less likely” to consume pornography compared to other Americans. He calls this “moral incongruence” and explains how conservative Protestants’ “avoidance of pornography does not (and perhaps cannot) keep pace with their professed opposition to it.”

This moral incongruence has changed how evangelicals relate to pornography. The moral conviction against porn remains strong, but there is also sympathy for its consumers.

Whereas non-evangelicals may observe a contradiction when it comes to supporting both Christian values and President Trump, I have found in my research that conservative evangelicals don’t have to see it that way. Their logic supposes that giving into sexual temptations is part of the human condition: People are prone to sin and must seek forgiveness and support.

A man like Donald Trump, in other words, could benefit from the pages of evangelical self-help books. But his sexual failings needn’t get in the way of conservative politics.

Kelsy Burke does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.