A non-invasive system for inducing penile blood vessel and erectile tissue volume changes, comprising a cylindrical socket, having interior walls and an open end with a circumferential sealing element, and a control unit connected to pressure pumps are provided, wherein a compartment defined by the sealing element and the interior walls is in a state of positive pressure, or in a state of sub-atmospheric pressure. Pressure reservoirs, connectable to the compartment and to the pressure pumps, and mechanical switching elements connected to the pressure reservoirs are provided. Measuring elements are also provided, wherein the control unit is capable of receiving a signal from the measuring elements and determining a time, rate and shape of measured pulse-waves, and wherein the control unit is gated by the measuring element to control the switching elements to switch connectivity of the compartment to the reservoir and alternately switch the compartment between states.