Children need both their mother and their father. This is the reason that Jesus said to let no man separate what God has joined together. When people move in with someone else or remarry; they are letting another person separate the family. Children are tossed from household to household with unrelated strangers living in both houses with their parents. Sometimes they are even abandoned by their father and sometimes their own mother for another adult. These unrelated strangers will sometimes use their hands to force these little children to do what they want. As a result, many children are neglected, abused emotionally and physically, and sometimes even killed in these dysfunctional houses.
These are the offences that Jesus was talking about. Adultery is very confusing to our little children. Our children need their parents so that they can know themselves. Otherwise, these adults many find themselves responsible for the offences that the next generation commits. God is the one that holds the adulterers accountable for what they do to the next generation. Protect your next generation. Do not commit adultery! (Luke 17:1-4)