I try to steer clear of the Old Testament but sometimes that is just too hard to do. Here are just a few.indeed they are. I'll look forward to what you can provide.
In Leveitcus 20:10-21 Moses was given the laws of marriage. If you read this you will see that our way of living & our laws today still adhere to these very principles of adultery & incest.
1 Pete 3:7 Instructs men to dwell with their wives with understanding. It is man's job, as a husband, to understand the woman he is married to. Think that isn't a job?!!!
1 Corinth 7:2 Tells us that is is not right to withhold sex from either partner unless it is agreeded upon for a time of fasting.
This text also reinforces the 'sex for pleasure' arguement. If a couple have had children & are past the childbearing years, what difference would it make? But it does. Sex is for the marriage relationship, the intimacy that causes a man & woman to become one. It cannot be done without it.
1 Corinth 3:16, 17 Says the body is a temple & should be treated as such. Thus refraining from any immoral or harmful conduct.
1 Corinth 7: 10-17 Advises us to keep the marriage vows; the love, honor & cherish; whatever comes our way; until we die.
We are advised throughout the Bible to be kind & loving towards our fellow man. How much more important is it that we should behave that way towards the one person we pledge to love above all others? Why would you ever say or do anything or take a chance purposely to harm that person?
Jesus, Himself said very little about the marriage realtionship. But I think His views on marriage are quite plain in the Commandments.
Fornication is not advised because of all the problems that arise from that lifstyle, but it seems that God understands that there are slip-ups.
But He included in the 10 Commandments the one about adultery, ( and there are many ways to adulterate the marriage) telling me that He views marriage as something sacred and needs to be kept in the highest regard.