Multi-Translation Layout:
5 Defraud ye not one the other, except it be with consent for a time, that ye may give yourselves to fasting and prayer; and come together again, that Satan tempt you not for your incontinency.
5 Defraud not one another, unless, it may be, by consent for a time, that ye may devote yourselves to prayer, and again be together, that Satan tempt you not because of your incontinency.
5 Abstaining from sex is permissible for a period of time if you both agree to it, and if it's for the purposes of prayer and fasting - but only for such times. Then come back together again. Satan has an ingenious way of tempting us when we least expect it.