Adultery is defined as carnal connection between a married person and one unmarried, or between a married person and the spouse of another. It is seen to differ from fornication in that it supposes the marriage of one or both of the agents. Nor is it necessary that this marriage be already consummated; it need only be what theologians call matrimonium ratum. Sexual commerce with one engaged to another does not, it is most generally held, constitute adultery. Again, adultery, as the definition declares, is committed in carnal intercourse. Nevertheless immodest actions indulged in between a married person and another not the lawful spouse, while not of the same degree of guilt, are of the same character of malice as adultery