It allows for mutual penetration between two persons (or for double penetration of a single female, both anally and vaginally). They are often made to resemble a penis, although some are C-shaped or S-shaped for G-spot or P-spot stimulation.
Dildos are generally made of silicone rubber, but can be made of other materials such as body safe metals such as titanium, stainless steel, aluminum, or glass. A dildo is a non-vibrating device which is used for sexual stimulation of the vagina or anus.
The internal rolling is claimed to enhance orgasms.
