1 Corinthians 6:18

The apostle cometh to a new argument, by which he presseth them to flee the sin of uncleanness. It is observed by some, that this sin is peculiarly to be resisted, not so much by resisting it, and pondering arguments against it, as by flying from it, avoiding all occasions of it, and not suffering our thoughts to feed upon it; but the apostle's argument is, because other sins are without the body, that is, the body hath not such a blemish and note or mark of infamy laid upon it by any other sin as by this: in drunkenness the liquor, in gluttony the meat, in other sins something without a man's self is that which is abused, but the body itself is the thing which is abused in this filthy sin. So he that is guilty of it, sinneth not only against his wife, with whom he is one flesh, but against his body, which he abuseth in this vile and sinful act, and upon which he imprints a mark of infamy and disgrace, a blot not to be washed out but with the blood of Christ. So as though by other sins men may sin against their own bodies, yet by no sin so eminently as by this sin. Other sins have their seat in the mind and soul; the body, and commonly some particular member of the body, is but the servant of the soul in the execution and committing of them; but lust, though indeed it ariseth from the heart, yet it is committed more in the body than any other sin is.