You have heard that it was said, “You shall not commit adultery”; but I say to you, that everyone who looks on a woman to lust for her has committed adultery with her already in his heart. And if your right eye makes you stumble, tear it out, and throw it from you; for it is better for you that one of the parts of your body perish, than for your whole body to be thrown into hell. And if your right hand makes you stumble, cut it off, and throw it from you; for it is better for you that one of the parts of your body perish, than for your whole body to go into hell. (Matthew 5:27-30).
When lust is conceived, it gives birth to sin; and when sin is accomplished, it brings forth death. (James 1:15).
Do not let immorality or any impurity …even be named among you, as is proper among saints; and there must be no filthiness and silly talk, or coarse jesting, which are not fitting, but rather giving of thanks. For this you know with certainty, that no immoral or impure person…has an inheritance in the kingdom of Christ and God. Let no one deceive you with empty words, for because of these things the wrath of God comes upon the sons of disobedience. (Ephesians 5:3-5).