These essentially refer to any kind of sex toy that is primarily used for masturbation, either solo or with a partner, which is difficult to categorize. Masturbation toys cover a wide range of pleasure giving devices, and include specific sex tools for women, sex tools for men, and unisex masturbation toys.
Female masturbation aids include such tantalizing devices as clit ticklers and clitoral pumps, which are designed to stimulate a woman's clitoris, and more unique designs such as vibrating panties or the Sybian sex toys for woman.
Sex tools for guys including artificial vaginas, the Aneros sex tools for man, the Sex Machine, the Venus 200 Masturbator and such wonderful devices as the Tenga Onacups sex aids.
While many toys can be considered as unisex tools, most masturbation aids were in fact originally designed for either men or women, although instruments like butt plugs and anal beads are specifically designed for and enjoyed by both sexes equally.