crazyeyd. Women have a better chance of subbing than us guys. You have a natural place to hide the bottle of urine and no worries about the temp being right. You just need to practice. Noise will be the main issue. QF has a alittle flip spout that you can open with a finger nail, but you have to be careful after squeezing to release the pressure on the bottle gently so that it doesn't make a sucking noise.