Any dildo can be used by hand but some are specially designed for that purpose. As fun and healthy as masturbation is, it can be wearing on the wrists and arms. Ergonomic dildo's with handles attached make for less of a tendon tiring reach. G-spots and prostates both respond best to a firm pressure, a type of stimulation that is hard to give with a straight slightly soft dildo. Glass dildo's or stainless stell rods are designed for g-spot stimulation and as weights to use for a PC muscle strengthening vaginal workout. Hand held toys are fun to use with partners too of course.