First of all, marriage is a rule that humans have arbitrarily decided upon, and is completely separate from the inherent "reproductive instinct." In short, humans cannot live without sex. Do you understand what I'm trying to say? If you rely on the rule of marriage and treat your wife carelessly, she'll end up exposing her naked body in front of a camera, cumming over and over with another man's dick, and getting covered in semen. Is your wife really satisfied?