I have solved the delema of wetting while on your stomach. This is how you should lay. So your laying on your stomach right so what you want to do is put your legs straight out so your laying completely straight then take either your right leg or your left leg and strecht it out to the side and bend your knee to were it makes a 45 degree andle sort of like this.
if you cach my drift. it might work i dont know it works for me so just try it. HOPE THIS HELPS!!!!!!!