“Everyone who divorces his wife and marries another commits adultery, and the one who marries a woman divorced from her husband commits adultery. The Parable of the Rich Man and Lazarus.
Consequently, while her husband is alive she will be called an adulteress if she consorts with another man. But if her husband dies she is free from that law, and she is not an adulteress if she consorts with another man.
A wife does not have authority over her own body, but rather her husband, and similarly a husband does not have authority over his own body, but rather his wife.