Yes

"Fine but remember you swore"
She Hands Dave the Bone.

"Do you swear" asks Dave "That if you use the bone on me without permission you will loose my love and the ability to enjoy sex ever again? Oh and do you give your permission for me to use the bone to seal this promise?"

"Yes and Yes" says Maggie.

The bone throbs in Dave's hand as he wishes that what she has sworn will come to pass should she transgress.

"So Dave:" says Maggie. "Do you want the first Day or do you want me to have it?"