NET
18 Flee sexual immorality! “Every sin a person commits is outside of the body”—but the immoral person sins against his own body.
Darby
18 Flee fornication. Every sin which a man may practise is without the body, but he that commits fornication sins against his own body.
KJV
18 Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.