The battle of the sexes is moving into the sky—or, more specifically, to toilet seats at 36,000 feet, thanks to All Nippon Airways’ (ANA) decision to introduce women-only lavatories on its international routes. One toilet in each class will be reserved exclusively for ladies, and men won’t be allowed to use them except in emergencies or when there aren’t many female passengers. ANA says the move comes in response to an online survey in 2007 in which 90 percent of women polled said they would support such an idea. Apparently ladies don’t like using shared toilets as men sometimes leave the seat up. The toilets will be designated on most international routes, excluding some flights linking Tokyo, Osaka and Nagoya with Asian cities such as Seoul, Beijing, Shanghai, Qingdao and Mumbai.