Transcutaneous electrical nerve stimulation (TENS). This procedure strengthens the muscles that control urination. Your doctor places thin wires inside your vagina, if you’re female, or in your bottom, if you’re male. It delivers pulses of electricity that stimulate your bladder muscles to make them stronger. Studies show that electrical stimulation works better than fake stimulation (placebo) or Kegel exercises to relieve OAB symptoms. It's not clear whether one type of stimulation works better or is safer than another.