<p>6:18 <i>Flee fornication- </i>Surely an allusion to Joseph literally fleeing from sexual temptation.</p><p><i>Every sin that a man does is outside the body, but he that commits fornication sins against his own body- </i>Whilst Paul does have in mind the use of the physical body, we must bear in mind that &quot;the body&quot; in Corinthians is usually used by Paul in the sense of the body of Christ. We also must answer the question as to how sexual sin is a sin against our own body. Sin is surely against God and against persons, rather than against the sack of water, calcium and complex chemicals which forms the human body. The Greek <i>eis</i> translated &quot;against&quot; is a very common word in the Greek New Testament, and usually carries the sense of &quot;in&quot; or &quot;within&quot;. Within our bodies And the context of 1 Cor. 6 is about how our individual behaviour affects the body of Christ as a whole. Sin is sin not only because it is a technical infringement of Divine law, but because of what it does to others in practice. Sexual sin in particular rarely simply affects two persons. If a sister commits adultery in an ecclesia with a brother, there are many other parties affected, and ecclesias so often divide as the members take sides as to how to deal with the issue, and in their foolish human efforts to apportion blame- &quot;She was more responsible... he was easily led... but her husband is abusive, you can understand how it happened... he has baptized kids and young grandchildren, you can't disfellowship him&quot;. The context of Corinthians is warning against turning the breaking of bread meeting into the kind of <i>symposium</i> common in Corinthian society, whereby a group of equals met together to hear a speech of common interest to them, relating to their trade guild or religion, and it turned into a time of drunken revellry and use was made of prostitutes. The command therefore to &quot;flee fornication (Gk. <i>porneia)</i> (:18) doesn't so much speak of going too far with your girlfriend (which is wrong but for other reasons), but is a warning against the systematic immorality (<i>porneia</i>) of using prostitutes. See on 5:11. Paul is arguing that what's wrong with this is that it's a sin against the body of Christ, against many others within the body, and thus against Christ personally, whose body we are part of and individually representative of. This would explain why he writes of &quot;your 'you' plural body&quot; (:19).</p>