Lust is in the hearts of men. Lust of the flesh, lust of the tongue, and lust after the material things. These are all spiritual adultery to our bridegroom Jesus Christ. That is why 2 Timothy 2:22 says, "Flee the evil desires of youth and pursue righteousness, faith, love and peace, along with those who call on the Lord out of a pure heart." God is calling us to live a pure life. Just as He is Holy we ought to be holy also.