I think it pretty clear that some people have no sex drive and no desire. Do you disagree? What happens when a relationship is one sided regarding this aspect, but strong in others? Would it be wrong for a spouse with no sex drive to have sex for the benefit of his or her partner? Would the relationship be unhealthy?
I think what ever a couple can negotiate that makes them both happy is fine. Knowing yourself and being honest and upfront is crucial. If one partner has a very strong sex drive and the other's is non-existent, this is a basic incompatibility that would be a deal-breaker for many. However, if the rest of the relationship is so strong that the one partner is willing to forgo a lot of sex to keep it or the other partner is willing to have sex when they really have no interest or desire, then there is nothing wrong with it or unhealthy about it. Honesty and openness is the key to that working out.
What won't work is if one person pretends to want sex or the other is silently resentful they are not getting enough. Or, if they start thinking, "Ok, I made this sacrifice for you, now you owe me something in return. What are you going to do for me.
Generally, the more compatibilities two people have, (sexual, religious, or otherwise), the greater chance of being able to negotiate a successful relationship.