When married people feel the urge to have extra-marital relationships they must protect the feelings of their spouses and children. It is healthier to be honest to oneself even if it involves being dishonest to others. Repression of desire for another is being dishonest to oneself. This goes for persons closely related to me. They may cultivate any relationship they want provided they keep me in absolute ignorance and not let it became a scandal.
All religions preach peace and harmony.
It is true that all religions preach peace and harmony. All of them looked for endorsement from their own leaders. Besides that, every religion regards its founder more important than God and superior to founders of other religions. Christians not only regard Jesus as the son of God, the king of kings, but also the greatest man born. Muslims regard Prophet Muhammad as the perfect human being.