As someone whose married life is essentially without sexual intercourse, I say yes, it can be a big deal.
That is pretty harsh, if it is not due to a medical problem or something then this is essentially the same thing as adultery, the conditions of marriage are not being met.
I highly recommend this website, they are on the cutting edge of mending relationships because they address the underlying causes of broken marriages.
marriedmansexlife.vanillaforums.com/
It is not Christian specific and it can be a bit vulgar at times, but it does not pull any punches and gets straight to the issues of why women cheat or withhold sex in marriage. It helps you develop a plan to fix the issues.
Most of the time when a woman has an affair or withholds sex the relationship has essentially ended. It means that she has lost attraction to her husband and he lost status in her eyes. They have become attracted to a more high status alpha male. Women are mostly unaware of this phenomenon in themselves, they are often confused to why they have these specific feelings. But this has been observed so many times by so many people that it is really not very deniable.
A man who has an affair can quite possibly still love his wife and still find her very attractive, but a woman who cheats has essentially already left the relationship. This is why I say that I would not deal with it well if it happened to me, and I would end the marriage. It can be repaired but it is so damaged at that point that I don’t think I would be interested in continuing.
Just a lack of sex is a better situation and can possibly be fixed.
I know that adultery is hurtful to both men and women, there is feelings of betrayal, distrust, fear of abandonment, humiliation, and anger. But it goes in further for men, he has essentially been cuckolded. A woman in an affair has usually chosen another man who is of higher status than her husband. Either more money, power or simply more masculine in some way.
The husband is lowered in the socially hierarchy and he can’t even be sure if his children are his own. His headship in the family is gone and he has been emasculated.
This is why it is so hard to deal with the Church’s teaching, basically if you divorce and adulterous wife you have to live your life as an emasculated eunuch while you wife gets the house, children, much of the assets, and continues to have her sexual relationships at will. She also gets comfort that you will never get to marry again and will continue to be able to hold that power over him.
In ancient times there was much much less divorce an adultery so these things did not become as much of an issue, there was shame in society for people who acted like this. The woman did not have the social power to jump from relationship to relationship or the favorable divorce laws to control the finances as well.
In modern times with a divorce rate of 50%, rampant free sex and adultery, feminism, hookup culture and no fault divorce, this Church teaching essentially helps fortify the destruction of men, in modern times without the social stigma of adultery/divorce it facilitates the removal of a man’s Christian headship in his family.
The only real power men have in relationships is his ability to or threaten to leave and find a new mate. With this power removed by the Church a man essentially lives his life under the thumb of his wife. Even if he divorces, becoming a eunuch is very large step down in the socially hierarchy and his wife is essentially emboldened because she is never threatened by another women.