Rules, and regulations, prompted to cause suffering. For no man on the face of the earth can deny his nature. Basic human nature. Yet, almost every rule and regulation under religious guidance goes against our nature. Take passion for instance.
Passion is a basic natural response.
Unless, one gets an approval from their social churches. This by way of some form of marriage, some legal binding documentation. In marriage you are not making any promise to a loved one, that you could not make in private. No, you are promising the church, and the flock of that church, that you will not embarrass them by committing lustful acts before their approval. And all this, in the name of a God that supposedly gave us the intelligence to determine our feelings between us.