I don't want to get into a long discussion about 'anything short of sin' because it is probably another issue. But when people use this expression what they are often referring to is what Paul meant when he said 'to the jews I become a jew...i have become all things to all people so that by all possible means I might win a few'.

It is just saying that they are willing to do anything (except sin) to reach people for Christ. An example might be...

> Go to a nightclub with non-Christian mates (to the jews we become a jew). But make sure we don't get drunk (anything short of sin).

I don't think it means deliberately flirting with sin for the sake of it. It just means not conforming to others legalisms if it means people miss out on the gospel.

Jesus is a good example of this. He saturated himself with sinners, but didn't sin.

Mark