are serious because they undermine the foundation of family life, the oneness of the marriage relationship, and one's covenant commitment made before God.
Adultery is a violation of the oath sworn before God that constituted the marriage.
For though this commonly goes under the name of love [pity it is that so good a word should be so abused] yet it is really as great a violation of it as killing and stealing. He that tempts others to sin, though he may pretend the most passionate love does really hate them.
The Bible's condemnation of adultery includes such things as communal marriage, mate swapping, "open marriages", homosexuality, incest, and voyeurism such as pornography, fornication.
God likens idolatry to adultery because of the divine-human and husband-wife relationship.
Exodus 20:14; Lev. 18:22, Rom. 1: 26-27; 1 Thess. 4:3; Heb. 13:4.
We should not make our present vile bodies more vile by sinning against them.
Morally despicably, physical repulsive, tending to degrade, disgustingly or utterly bad....In short you are degrading yourselves and God.
In the book of Revelation, fornication is symbolic of how idolatry and pagan religion defiles true worship of God [Revelation 14: 8; 17:4].