A guy cuddled up to his wife and softly whispered into her ear: "Could we make love, please dear?" 

She rolled over away from him. "Not tonight, darling, I've got a splitting headache," she replied rather tersely. 

Too horny to read the obvious signals the husband pleaded. "Please, honey. I'll only stick it in for a minute" 

"What do you think I am," his wife retorted, "a microwave?"