I think this is an excellent analogy. As a person with no real interest or drive, myself, I don’t think I’m a horrible person for it. It frees up my thinking in a lot of ways, really. For one thing, I know and my husband knows that I’ll never, ever, ever cheat

and when we’re old and can’t do it anymore, he knows I’ll still be in love with him.
That said, we have four living children and one we lost in the space of 13 years together. We do have our moments of not “getting together”, largely due to age of children and pace of living, but we’re still doing better than 4 times a year. More like a few times per month–just not every day, or even necessarily every week.
It’s a major sacrifice for me, because I really, truly, don’t like it 99% of the time. I love my husband, though. He knows how I am, but he accepts it. That’s hard for a man to do. Most men would leave a wife like me…or never marry me… because our society is obsessed with sex and constantly bombards men, making even their natural state of physical neediness soar through the roof.
I do get a little irritated with people who think it’s horrible NOT to have near-constant desire, even for the person you love. It’s not my fault I don’t have it. I still love, I just don’t have a deep interest in that aspect of love. I mean, asexuals just love differently. We’re not defective. In a lot of ways, I think we’re better off. Endless appetite for anything would be difficult and distracting from the complexity and wonder of life outside of physical pleasure.
We do still have to do it (like eating healthy or drinking water) if we’re married. Probably, most asexuals would be happier living the life of a religious where there’s no pressure for something they don’t want. But, that’s not always the case and not always possible for one reason or another.
Again… I don’t believe you can always “medicate” or “therapy” away an innate quality of an individual. Maybe in some cases there is a medical cause. But, I am perfectly healthy and just not all that interested. No fault to my husband at all. He’s attractive and loves me/the kids. That’s why I make the sacrifice to at least try to be there for him in that way… even if mentally, I just don’t “get it” or understand why he feels the way he does about the act.