I do believe in the logic behind the marriage If we only reserve our sexual desire within our marriage then it means we do not place others into our sexual fantasy but we would want to explore our sexual relationship with our individual partner. That also would leads to another level of respects for man and woman to have a higher ground of what we should be thinking of others. In other words, a man should not think of a woman as a sexual objective that he could having a sexual fantasy towards her since she is not your wife. The woman is actually a mother of someone who they have much respect for. The woman who could be someone's love one. To fantasizing over someone does not need to be in a sexual way alone, a healthy fantasy then should not be a sexual thought since there is only limits for each one of us to have a sexual partner. This is all very much an idealist and only claims it's not wrong since I have done nothing that has happened in my mind, however, when we have a clear understanding about sex and marriage then we should know what exactly is the right or wrong thing to do. Practice makes perfect applies to all occasions.