Specific Aim 1: To assess voiding efficiency (voided volume/{voided volume + residual volume}) in women controls with and without urethral anesthesia Hypothesis 1a: Voiding efficiency will be lower when the urethra is anesthetized during micturition pressure-flow studies Hypothesis 1b: Detrusor contraction at maximum flow rate (Pdet@Qmax) and duration of detrusor contraction will be reduced when the urethra is anesthetized during micturition pressure-flow studies Hypothesis 1c: Voiding while anesthetized will lead to increased valsalva-voiding (increased intra-abdominal pressure, Pabd) and an intermittent urinary stream during micturition pressure-flow studies