For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
Peggy Johnson
A sexless marriage can stem from a medical/physical inability. Though, a better question may have been, "Can a marriage survive without intimacy?"
Jack Gutknecht
Amanda, I liked this: "Even the littlest unforgiveness can grow into a large tree of bitterness. My husband and I have initiated a weekly TGIFF (Thank God Its Forgiveness Friday). We sit down with each other before dinner and look at each other in the eyes, and ask if there's anything we have done to hurt the other person. And we take turns listening, repenting, and forgiving. No offense is too small." My wife & I should do this.
Your opening statement, 2nd sentence, was also powerful: "My opinion is based on 1 Cor 7:5, which talks about not abstaining from sex in a marriage unless upon mutual consent, so both parties can pray. A sexless marriage, in my opinion, is comparable to a prayer-less relationship with God."
But what did you mean by your concluding statement, " A sexless marriage needs help and is usually directly parallel to the intimacy the marriage knows with God."