A method treating erectile dysfunction includes implanting a penile implant including a first bladder and a second bladder, the second bladder filled with a liquid having a rest viscosity. The method additionally includes increasing a pressure in the first bladder of the penile implant from a first pressure to a second pressure, and increasing a viscosity in the liquid from the rest viscosity to a second viscosity greater than the rest viscosity. The method further includes maintaining the first bladder of the penile implant at the second pressure and the liquid in the second bladder at the second viscosity.