Can a person legally consent to sexual activity that will take place after that person is rendered unconscious?

No, say feminist legal scholars, because consent has to be "revocable at any time," and a person can't withdraw her consent if she's not awake. Yes, say the lawyers defending the man who choked his wife into unconsciousness before penetrating her with a dildo, because the state shouldn't tell people that they can't "consent to having their bodies used in those ways," we consent in advance to surgery before being put under, and besides telling people they can't consent in advance to unconscious dildo play, “degrades our humanity.”

The Canadian Supreme Court will get the last word. (This seems to have been overlooked in the debate about consciousness and consent: choking "games" are extremely unsafe.)