I threw them in the fire

 "I've put the champagne on ice, the bed has been turned down and I have scattered some rose petals on the stairs. Is there anything else you want me to do Dear?"

"Have you got your new cuckold's cage on your little willy."

"Yes Dear! Of course."

"You do know the significance of Master's visit tonight, don't you?"

"Of course I do. You have both been planning this for months."

"One more thing Dear."

"Yes My Love?"

"Where have you put my birth control pills?"

"I threw them in the fire - just as Master ordered."