A device for erotically stimulating the male sexual organ and for obtaining an erection by males with Erectile Dysfunction Disorder includes a soft plastic cylindrical container having an open end which forms a cavity for receiving the male sexual organ. The device further includes unattached free-moving membrane-like material within which tap water is sealed inside and said material thus inserted, entirely within the said container. The device is the only device in the medical and sexual aid fields that can easily be assembled at home and provides simultaneous sucking action and realistic-like membranous tactile sensation to the male sexual organ replicating the female vagina.