It is the duty of every Muslim to follow the Islamic laws not only in matters of prayers and fasting but also in all his actions. Islam has well defined rules about marriage. So if you want to follow Islam fully, then you must know the Islamic rules and regulations governing married life. Islam has never repressed the natural feelings of human beings but provides rules, which are divine.
Western morality permits many things that are prohibited in Islam. The reason for the prohibition of certain actions is not to act as an infringement of an individual's freedom but because Islam is concerned not only with your physical well being but also your spiritual enhancement.