"If we are married, be faithful to our spouse in our thoughts, words, and actions. The Lord has said: 'Thou shalt love thy wife with all thy heart, and shalt cleave unto her and none else. And he that looketh upon a woman to lust after her shall deny the faith, and shall not have the Spirit; and if he repents not he shall be cast out' (D&C 42:22-23). We should never flirt in any way. As much as possible, we should avoid being alone with anyone of the opposite sex and ask ourselves if our spouse would be pleased if he or she knew of our words or actions. We should remember the Apostle Paul's counsel to 'abstain from all appearance of evil' (1 Thessalonians 5:22). When we stay away from such circumstances, temptation gets no chance to develop."
(Chastity-lds.org)