What are some reasons why some Christians may disagree with adultery? Add sources of authority.

One of the 10 commandments is 'you shall not commit adultery' The Bible says 'flee from sexual immorality' (the engagement in sexual acts outside of the sanctity of marriage. The Bible says 'If a man commits adultery with another man’s wife ... both ... are to be put to death'. The Bible says 'If a man is found sleeping with another man’s wife, both ... must die'. The Bible says 'The acts of the flesh are obvious: sexual immorality ... those who live like this will not inherit the kingdom of God'.