79 Toilet paper

Stepping out of the shower, a woman stands in front of the mirror, complaining to her husband that her breasts are too small. Instead of simply telling her it's not so, the husband jokingly comes up with a suggestion: "If you want your breasts to grow, then every day take a piece of toilet paper and rub it between your breasts for a few seconds." Willing to try anything, the wife fetches a piece of toilet paper and stands in front of the mirror, rubbing it between her breasts. "How long will this take?" she asks. "They'll grow larger over a period of years," he replies. The wife stops. "Why do you think rubbing a piece of toilet paper between my breasts every day will make my breasts grow over the years?" Without missing a beat the husband says, "Worked for your butt; didn't it?"