" Headache, hmm?" His expression went serious. "Do you know what's the best cure for that?"

"What?"

"Orgasm."

He said it so matter-of-factly I had to sputter a laugh.

"Multiple, if possible," he continued. "It's a proven medical fact that one physiologic event, like orgasm, can cancel out the effects of another physiological process, such as a headache."

His expression was perfectly serious, but I said, "You're full of shit."

"Perhaps. If so, you should call my bluff. Just open the door and we'll test it out. "

― Kelley Armstrong , No Humans Involved (Women of the Otherworld, #7)