Right, even as a joke the above proposal makes little sense. If a king suspects his eunuch of secretly being a predator, the eunuch can at the very least easil

Right, even as a joke the above proposal makes little sense. If a king suspects his eunuch of secretly being a predator, the eunuch can at the very least easily prove that he is in fact a eunuch. With an asexual, no such proof can be demonstrated. You have to take their word for it. Eunuchs were valued because you didn't have to take their word for it. If you have to take their word for it, then you may as well hire anybody and take their word for it. But also consider this: a creepy incel predator can lie and claim to be asexual, but will find it much harder to convincingly lie about being in a healthy relationship. They probably wouldn't normally do that, but given the right incentives (being trusted with other people's computers) they very well might. I don't and wouldn't distrust asexuals any more than anybody else, but neither would I trust them any more than anybody else. It just doesn't make sense.