Asexual humanity would plan childbirth carefully and not as a side effect of having sex for sex. In world without attraction breeding would be only for breeding purposes.
This would lead to generation of offspring that is taken care of better with stable households because there would be no romantic or sexual drama that tears them apart like it does today.
human relationships would be governed by practicality not idiots forming bonds out of sentimentality.
I would also add aromantic to the mix to further enhance them, it would be perfect species like 47