Matthew 15:19
19 aFor out of the bheart come evil thoughts, cmurder, adultery, sexual immorality, theft, false witness, slander.
Matthew 5:28
28 But I say to you that everyone who glooks at a woman with lustful intent has already committed adultery with her in his heart.
Ephesians 5:3–4
3 But xsexual immorality and all impurity or covetousness must not even be named among you, as is proper among saints. 4 yLet there be no filthiness nor foolish talk nor crude joking, which are out of place, but instead let there be thanksgiving.