All the time. My husband and I've been best friends since we were in 9th grade and he is very shy and embarrased about peeing. He would never just do it in public like most guys I know, he even tries to avoid public toilets at all cost or is too shy to admit he has to pee and would rather hold it than to use the toilet in a friends house.
I remember dozens of times were we went home together after school and he was visablly bursting. Also every time we go out or have longer car rides he ends up being desperate or had to use a bottle in the car, while I'm driving.