Perhaps the better term would be "consensual." In order to give consent, a person must know that the alternative -- refusal -- is an option that will be respected.Guy Gardener said:
HA! But it wasn't involuntary! The Cogenitor didn't know that refusal was an option and she didn't know that it wasn't supposed to dislike being used. It just wasn't part of it's world. You might as well be using a hammer to screw a screw. The Cogenitor did what it was told because it was raised to think like a thing which did what it was told with out remorse or a second thought like a well trained dog or horse.
Charles didn't even have the right to decide to take some time off to go mountain climbing, nevermind refusing to help others conceive children it would never see.