Abstract: An exercise device for strengthening the muscles of the pelvis, particularly the collective group of muscles involved in human sexual response, which are also important for controlling the evacuation of the intestines and the bladder. This exercise device focuses on increasing the strength, tone and endurance of these muscles. The device comprises a longitudinally extending member that includes a blunt head portion and a compressible shaft portion. The first end of the shaft portion is juxtaposed with the head portion. The first end of the shaft portion has an outwardly extending retaining slope formed thereon, particularly when the device is received within a pelvic body cavity and the muscles of the pelvic floor are at rest. The retaining slope is engageable with the retaining edge of the adjacent pelvic floor muscle platform of that pelvic body cavity to facilitate intracorporal retention within the pelvic body cavity.