Dildos come in a range of sizes to accommodate beginners or experts. While dildos are usually phallic-shaped there are some exceptions, like glass dildos which can be curved, straight, or wavy. Glass dildos are extremely popular sex toys; they can maintain different temperatures, are attractive, and they are easy to clean. In addition to glass, dildos can be made of Cyberskin, silicone, jelly and other materials. There are also realistic dildos which are molded from actual penises as well as double dildos which have two heads.