Cross your legs when standing. Don't cross your legs when sitting. Doing this can result in pain or possible loss of bladder control. When standing, crossing your legs helps you "hold it in" by compressing the urethra, surrounding tissues, and (in females) the genito-urinary opening. However, when sitting, any position which raises one or both thighs towards your abdomen causes pressure on the bladder, making it harder to hold it. via: http://www.wikihow.com/Hold-in-Pee-when-You-Can't-Use-the-Bathroom