Point of clarification: "lewd conduct" = infidelity. So for instance, if my wife and I take vows to remain married but then we separate or divorce, according to our vows, we should both keep the marriage bed sacred and not become involved with another person. However, if my wife begins a relationship with another person, then I believe I am free to move on and remarry. We are not beholden to the other person if they are not going to keep the marriage bed sacred. Such is not verified simply by having a marriage license or certificate. So with that scripture reference in mind, is God deferring authority to a legal document or proceeding? I think not. If my wife and I separate or divorce, then until she or I defile the marriage bed then we must not engage in infidelity. So if, for instance, my ex-wife is now remarried, then I am no longer beholden to her.