Abstract: A non-invasive tumescence enhancing and sustaining applicator replaces or augments an existing applicator which is prescribed for use by men who have had surgery resulting in impotence, or circulation problems making it difficult or impossible to achieve an erection. Tumescence is achieved by applying a vacuum to the flaccid penis with an evacuated cylinder, there being an annular seal inside the cylinder which creates a sliding hermetic seal with the penis to permit the vacuum to be drawn and sustained even while the cylinder may be moving or moved axially relative to the penis.