i don't usually but was forcd to for the last couple of months. Being pregnant with a tilted womb pressing on my bladder i could only pee standing up Dh found me once in the middle of the night standing naked in the shower, stamping my feet in an effort to pee, should have seen the look on his face. fortunately i can now pee sitting down again.
Don't generally though, why would you when you've got a loo?