Sex is an important part of marriage. It shows interest, love, and need for the SO. It gives a release and feeling of being needed. It is part of the reason that two people get married in the first place.
Lack of sex in a marriage can cause the SO who feels shorted in that department to begin to look outside the marriage for that release.
Marriage's can survive a lack of sex...but it is in no way easy. It can become the source of many arguments, much pain, and sometimes a deep-seated sore that is hard to treat.
Sometimes I think I must be crazy to be where I am.