A sexual aid device, for allowing a user being a first party of sexual relationship with a second party, to simulate the physiologic reaction of the penis of a human male, which comprises a hollow penis body made of flexible or semi-rigid material and containing an inflatable air or fluid tube for causing the penis body to be in its erected state when the inflatable air or fluid tube is maximally inflated and for allowing the penis body to be in its descended default state, when the inflatable air or fluid tube is deflated； a simulated scrotum made of flexible or semi-rigid material, having a compartment for containing means for controlling the inflation and deflation of the air or fluid tube； a pump for inflating the air or fluid tube； a controllable valve for deflating the air or fluid tube； one or more sensors located on the penis body, for detecting physical contact of the penis body with the body of the second party； a controller for controlling the controllable valve to be closed and the pump to inflate the air or fluid tube up to a maximal pressure, according to input signals received from the sensors and to deflate and the controllable valve to be open and deflate the air or fluid tube, according to different input signals received from the sensors； a power source for powering the controller, the pump, the valve and at least one sensor； means for attaching the sexual aid device to the body of the first party.
