Honestly, I hadn’t heard of this asexuality phenomenon until about 6 months ago. Maybe I’m not looking at this in the proper perspective, but if nothing else, we’re looking at passing on our genetic code, our “seed”. Why would someone voluntarily select themselves out of the “pool” like this?
I don't think that the asexuals would necessarily refuse to have sex at all. I think they just wouldn't see sex as a normal part of intimacy. For them, sex would be only a way to produce children. In many ways, some church groups have almost approached this kind of perspective. In the past, some church teachings have suggested that reproduction is the only purpose of sex and that any pleasure derived from sex or any sense of intimacy should be seen as suspect. They still want people to have sex and produce children, but they don't want people to enjoy it. I think some homosexuals may see sex in the same way. They want a child that is their biological child even though they want to raise that child in a "family" that couldn't have produced that child.
Bill