it starts with the lips. Matt. 5:28 to look on a woman to lust has already commited the act. the marriage bed (only ) is undefiled. Heb. 13:4 Does grace mean it is okay to break God's law? God will forgive sin through confession , but we must strive to overcome sin. We are not received if we are insincere. That would be sinning and then saying in our heart God will forgive. That will be a difficult thing to deal with if we are not sincere. God knows the heart.