"Flee sexual immorality. All other sins people commit are outside their bodies, but those who sin sexually sin against their own bodies." (1 Corinthians 6:18)
I remember my father (who was 37 when I was born) and his older sister (13 years older than him) describing young adulthood in the 1920s and 1930s. Women wore one-piece bathing suits that went down to the ankles. Non-Christians felt at least some guilt or shame if they had premarital sex, and in Christian circles virginity was the norm, with rare exceptions.
I had the "privilege" of having my adolescence span the turbulent period of the late 60s and early 70s when some women burned bras, Woodstock celebrated free air and love (i.e., a lot of public, outdoor sex), and Helen Reddy sang, "I am woman, hear me roar!" But still evangelical Christian leaders unequivocably upheld the historic Christian teaching on abstinence before marriage, even as not all of their young adult charges followed suit. Josh McDowell was still young, though, and spoke to rapt audiences of teens about "Maximum Sex"--i.e., saved for a heterosexual spouse.
Today, I regularly hear youth pastors saying that most of the "Christian" kids to whom they minister have had premarital sex. I hear well-read Christians of various ages admitting they're not sure the Bible really excludes the practice, since most of its prohibitions involve adultery--breaking the marriage covenant. I hear still others insisting that it doesn't matter what the Bible says about sex, it's as outmoded on the virtues of virginity as it is on gender roles in home and church. There's nothing wrong and a lot right about sexual relationships between consenting adults, they allege.
The Bible hasn't changed, nor has God's Spirit, which enables humans to obey Scripture. So why are we giving up (or giving in) so ridiculously easily and prematurely in this area?
Then one reads 1 Corinthians 6:16 and just scratches one's head. What? "Sexual immorality" (porneia or "fornication"--sexual relations with anyone other than a heterosexual spouse) is a unique sin against one's own body? What about cutting? What about alcohol or drugs? And surely suicide is the ultimate sin against one's body!
All very true, so long as "body" (sōma) is taken as meaning just the tangible or fleshly part of a human being. But the scholars who have researched the term in depth tell us it can also mean the human person in his or her most intimate acts of communication or communion with others. I suddenly start to understand a little better why the word "intercourse" is used both for conversation and for sex!
Now verse 16 makes sense. Plenty of sins damage one's own body but don't affect the bodies of other people. Sexual intercourse, by definition, requires two people. It is the most intimate of expressions of self-giving love; two people naked before each other, in postures and position that are meant to express ultimate vulnerability and therefore trust and ultimate allegiance, at least at the human level. Someone once said that what is most wrong with sex outside of marriage is not the risk of pregnancy or STDs, much as those remain even in our highly sexually educated society because people continue to refuse "protection." Rather, what's most wrong is that it takes from someone else what was designed to reflect the most intimate of human commitments without being willing to promise the ultimate loyalty intended to go along with that intimacy. Actually, they said it more succinctly and memorably, but I can't exactly remember how or where!
Augustine in his Confessions explained that once he got his sex life under control, he turned to his gluttony, because the same kind of drives were at work in each case, and the same solution required: delayed gratification. Maybe our obesity as a nation and our sexual incontinence are linked!