A method of implanting a penile prosthetic in a man includes providing a reservoir having a first major surface separated from to a second major surface by a side wall, the first major surface and the second major surface are both concave and form opposed depressions in the reservoir when the reservoir is empty of liquid. The method additionally includes connecting the reservoir to a pump that is connected to a cylinder, implanting the pump in the scrotum, implanting the cylinder in a corpora cavernosum of the penis, and implanting the reservoir in the man.