“Thou shalt not commit adultery.”
The seventh commandment forbids adultery, that is, unfaithfulness to one’s spouse and all unlawful lust. God forbids a husband and a wife to break the bonds of mutual faith and love. Of the unmarried, God requires pure thoughts and desires, to be chaste in word and deed, in thought and desire. In order to do this it is necessary to avoid everything that could give rise to unclean feelings in the heart: obscenity, immodest and shameless songs and dances, suggestive plays, movies, and pictures, immoral books, drunkenness, etc. God’s word commands us to maintain our bodies in purity, because our body is a member of the body of Christ and a temple of the Holy Spirit. Fornicators, and all who indulge in lustful acts or imagination sin against their own bodies, they weaken the health of their body, inflict illness upon it and impair its spiritual capability, especially imagination and memory.