Catechisma

Q72. What is forbidden in the seventh commandment?

The seventh commandment forbiddeth all unchaste thoughts, words, and actions.

Scripture Proofs — King James Version

1

Matthew 5:28

But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.

Matthew 15:19

For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:

Ephesians 5:3–4

But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints; Neither filthiness, nor foolish talking, nor jesting, which are not convenient: but rather giving of thanks.