How can I punish my wife?

Ro-hypnol. She wakes up in someone else's kitchen, and someone else is cooking food for the man of the house. She will notice this, and in a predatory urge for kitchen dominance, she will attack this woman. However, the other woman is trained in martial arts, and so will be winning. Wait until your wife has been punished enough, then intervene and "save" your wife. She will never leave the kitchen again, and will love you like a slave. Works a treat.