Christians quite rightly firmly state that sex outside the marriage bond is always wrong. Scripture relentlessly makes this point and it is found as one of the ten commandments: You shall not commit adultery (Ex. 20:14). However Scripture also makes the equally strong point that sex is for marriage.
I was reading the Song of Solomon recently and was struck, once again, by the evident enjoyment that the lover and the beloved had of each other and that included their bodies. Dare I say that Song of Solomon debunks any thought that our God is prudish. So we as His children should not be prudish either. Sex within marriage is right, totally right and to be celebrated and enjoyed.
Because we so often just hear the negative about sex, that it is not to be engaged in outside marriage, we can tend universalise it be a bad thing. If I am married I have to engage in it, but it is really rather impure. It is not impure at all. The Holy Spirit informs us in Hebrews 13:4 Marriage should be honoured by all, and the marriage bed kept pure; the marriage bed has purity.
Some feel guilty about being able to have sexual pleasure as if we are only sanctified to God through having unpleasant experiences. But God is wanting us to enjoy all of His provisions and goodness. Paul in 1 Timothy 6: 17b informs us that God richly provides us with everything for our enjoyment (and that includes sex).
So married christian couples go and pray about having sex together, go and have sex together, and go and enjoy sex together. And God will be glorified. And don’t forget to thank Him because: Every good and perfect gift is from above, coming down from the Father of the heavenly lights (James 1:17b).
There are some helpful insights on this theme here.