One of the best blessings to me in my singleness were friends who did not make marriage an ultimate thing in my eyes by only telling me the beautiful parts of their marriage, but who told me the difficulties of it as well. They also prayed for me actively to someday have the gift of marriage. I hope I am doing the same for my still single friends who desire the gift. I want them to know its not all romance and intimacy and good feelings and great conversation. But I also want them to experience the gift themselves so they can both see it and minister out of it. One thing it is very easy to believe during the long fast from sexual intimacy that is godward singleness, is the option to have sex will make things better. Most of us wouldn't be so foolish to say having sex makes things better, but it's darn easy to believe the option and permission to will make it better.
But sex doesn't make things better.
Not in the way you think it will.
Sex is good, God created it, he blessed it. He made it the integral piece in the procreation of humanity—science thwarts it and succeeds it but even science admits the masterful design of two humans making more humans. Sex is great, but it does not make all the angsts of longing for intimacy before marriage go away. All those angsts still exist within marriage, they just take different forms.
I know it's easy for the married person to say this, you protest, because at the end of the day I can still have sex. But what I wish I could tell every unmarried person I know is until we realize our issues are much deeper and more profound than a sexual itch for satisfaction, we will still find our desires unmet. Within marriage and without.
The blessing of sex between a husband and wife is not to relieve stress, to make me feel desirable, or to make my husband feel strong and manly. It is not even to conceive and bear children. These are all benefits, but none of them are guarantees. God doesn't owe us relief from stress apart from him, the guarantee I will always feel desirable (I don't), my husband will feel capable and sufficient (he doesn't), or children will be borne. God doesn't even owe us sex within marriage. None of the things we think sex will accomplish (and indeed try to chase inside and outside marriage), are guarantees.
When I hear those who are not married say "But at least you get to have sex! And live with your best friend!" Well, first, I'd warn against saying at least in regard to much. But second I want to say your words betray a much, much deeper need and the fact that you think sex or living with your best friend fixes it tells me you don't see your need as clearly as you think. If you think I'm just saying this because I'm married, trust me, I've been saying things like this for years and years as a single.
I've heard the illustration of the gift of sex for a man and woman in marriage like this: it's glue holding you together. But in my limited view sex is more like a reminder: I am not my own anymore, I am part of someone and sex is a tether to remind, seal, and strengthen the binding. Outside of marriage there would actually be no reason or benefit for sex because union with this specific person—my husband—doesn't exist. What I mean is, until he was my husband, he wasn't my husband and sex wasn't necessary (1 Corinthians 7:2).
I know this sounds very pragmatic but I want to be a bit pragmatic if I can. Our view of sex has been so colored by films and imaginations and images, and in many ways I want to sit down and say: sex just isn't as great as you think it is, and we don't need it like we think we do. It's greatness is not in how it makes us feel or how it destresses us or how awesome our orgasm is. It is only truly good in relation to the person with whom our body is intended by God to be joined with. Can sex outside of marriage feel good? Yup. Can masturbation curb the itch? Yup. But do either of them express worship of God with the gift He's given in the right context of covenant? No. Therefore, outside marriage it is not good. And inside marriage it is only good if it points to our incompleteness apart from God.
Unmarried friends, the sex you desire and think will satisfy your longing will not. Married friends, you still feel unsatisfied? Like your longing for something is never fully realized? All of this emptiness points to a greater need and a greater longing. Sex within marriage, if anything, makes the lack of complete culmination even more profound because no matter how perfect it is, it still isn't enough to still the longing in our hearts for God. Fasting from intimacy outside of marriage is preparation for how even within marriage we are still apart from our Groom until the culmination of all things.
My need is for Christ. In marriage and out. Sex is a gift from God but it isn't the ultimate gift and it certainly doesn't come without baggage of its own. We live in a broken world, my friend. If it doesn't feel perfect it's because it's not, and it's okay. Christ, our perfection, knows our longings and knows we are dust.
And that's better than sex.