A body implantable penile prosthetic assembly includes a penile implant and a reservoir. The penile implant includes a first bladder and a second bladder, where the second bladder contains a dilatant liquid. The reservoir is connectable with the first bladder of the penile implant. In this regard, fluid transferred from the reservoir into the first bladder of the penile implant imposes a shear on the dilatant liquid in the second bladder of the penile implant to increase viscosity in the dilatant liquid and harden the penile implant.
