Let me try to make this clear for you.
If you are married, and your wife runs off with another man, even if you are in a coma, she is committing adultery.
The existence of marriage, not consciousness therein, determines adultery.
If I were in a PVS I'd want my wife to remove the tube and move on with her life. If the government wouldn't let her legally, I'd want her to in spirit.
I disagree there Xena. If I'm comatose for 10 years, I've abandoned my wife and family, even if it's not of my own free will. To pretend that while lying comatose in a hospital bed that I was any kind of a husband or father would be a whopper of a lie. If I'm ever reduced to that state, I hope my wife moves on her, for her sake.