Should you ditch your bra? Marilyn Monroe slept in a bra to keep her assets firm and perky, according to Hollywood lore. A new study out of France suggests it might have been more effective for the screen goddess to go "au naturel" instead. Researchers spent 15 years studying the breasts of over 330 French women, and concluded that wearing a bra does not prevent sagging or ease back pain as commonly thought. "Medically, physiologically, anatomically—breasts gain no benefit from being denied gravity, Professor Jean-Denis Rouillon, from the University of Besançon, told France Info Radio. "On the contrary, they get saggier with a bra." Taking measurements with a caliper, the researchers found that by not wearing a bra, muscles around the breast actually strengthened and the "nipple raised 7mm per year toward the shoulder." However, the scientists did not recommend all women abandon their bras since their muscles had probably already...