A surgical method of treating erectile dysfunction includes implanting a penile prosthetic in a patient. The penile prosthetic includes an inflatable portion implantable into a penis that is attachable to a liquid reservoir, a pump, and a deflation assembly. The method includes implanting the deflation assembly in contact with an exterior surface of a pelvis of the patient, and positioning an activation surface of the deflation assembly away from the exterior surface of the pelvis. The method thus allows the patient to palpate the activation surface through skin.