The uni-sex-organ insertion membrane sponge assembly is basically embodied in a soft resilient flexible latex figured material which integrally forms an elongated penis-vagina organ impressionable channel encompassment, being continuous into each: a sponge ball impressionable bulged closed end portion a funnel mouth entry-exit orifice area a sponge pad impressionable bulged hem rim portion and, a seam bonded open-end portion. The sex-organ insertion membrane sponge assembly may also include an alternative improvement assembly means whereby an incorporated soft resilient flexible latex figured material integrally forms a triangular coccyx shaped convergence joint, being continuous into three seperately diverging strap extensions, which affixably overlap three equi-distantly spaced sections of said bulged hem rim portion and terminate at said seam bonded open-end portion, so that one said strap may connectably extend along between human buttocks, and so that two said straps may connectably extend along around human hip-thigh joints.