Clement of Alexandria in Stromata Book 3 says
Tatian here is clearly commenting on 1 Corinthians 7:5(1) The Syrian Tatian, as I see it, had the effrontery to make this sort of thing his creed. Anyway, he writes in his work On Training Following the Savior, and I quote, "Agreement conduces to prayer. The common experience of corruption means an end to intercourse. At any rate, his acceptance of it is so grudging that he is really saying No to it altogether. (2) He agreed to their coming together again because of Satan and because of weakness of will, but he showed that anyone who is inclined to succumb is going to be serving two masters, God when there is agreement, and weakness of will, sexual immorality, and the devil when there is not." (3) He says this in his exegesis of the Apostle.
Andrew CriddleDo not deprive each other except perhaps by mutual consent and for a time, so that you may devote yourselves to prayer. Then come together again so that Satan will not tempt you because of your lack of self-control.