Hot and Holy
Sexual morality is not a choose-your-own-adventure story. God has revealed his will for our sexual lives in Scripture and in nature. Nature, for example, reveals a fundamental biological complementarity of male and female, so it's clear that a heterosexual norm is God's design. But nature isn't our sole source for this knowledge; Scripture also reveals it through commands and prohibitions. We can't simply have a private intention to glorify God. No, our intention has to match up with God's intended order.
What about the claim that, as Christians, we're no longer bound by the law?
Christians often misunderstand 1 Corinthians 6:12, which says that everything is permissible although not everything is beneficial. In most modern translations, the first phrase is set in quotation marks. Why? Because Paul is not expressing a principle of Christian freedom; he's actually quoting some Corinthian men who were justifying visiting prostitutes. It was the philandering Corinthians who claimed all things are lawful, using that slogan to justify their immorality.
Many self-professed Christians adopt that kind of approach today. They simply declare that they can do whatever they want to do sexually because they are not under the law. But Paul says that this is a perversion of Christian freedom. The great irony is that we have been set free from sin to be slaves to Jesus. Jesus defines what we can and must do with our bodies sexually.
What does the purpose of sex have to do with the enjoyment of sex?
The common perception is that Christians are killjoys: cold, puritanical people who don't like sex. If so, then we fall far short of understanding God's purpose for sex and sexuality. Sex is a good gift designed to glorify God by consummating marriage, expressing love, procreating, and bringing pleasure. A Christian sexual ethic seeks to maximize joy and pleasure by enjoying this gift for his sake and according to his design. Our culture has made an idol of sex. But in idolizing a good thing, it becomes perverted, and joy diminishes.