Dear Rev. Is it a sin if I have sex with my ex-husband? He is remarried, but he wants me back.

Yes, it’s a sin to have sex with your ex-husband because sex is reserved for those who are married to each other. If he’s an “ex” then you’re not married to him. Even though you were married to him at one time, he doesn’t belong to you anymore. To have sex with him now would be adultery. Even though you’ve already had sex with him doesn’t make it okay now. And even though he wants you back, in God’s eyes he’s married to his new wife. Since he’s remarried he must be faithful to his new wife. This is what God expects. If he’s unhappy in his marriage he needs to seek counseling. Everything possible must be done to reconcile this marriage. Therefore, you shouldn’t interfere in any way. The Bible says, “For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh. So they are no longer two, but one. Therefore what God has joined together, let man not separate” – Matthew 19:5-6. Nevertheless there seems to be a pattern here. He’s lacking in commitment when it comes to marriage since he was already married to you once, then someone else and now he wants you back? Don’t you deserve better than that?