Choose a dildo made with non-porous materials such as body-safe silicone, glass, or metal. Use plenty of lubricant, but avoid using silicone lubricant with silicone toys.
The first dildos were made of stone, tar, wood, bone, ivory, limestone, teeth, and other materials that could be shaped as penises and that were firm enough to be used as penetrative sex toys.
Most lifelike dildos are made out of silicone for its soft, malleable qualities; some contemporary dildos are made from liquid silicone, which has a very natural skin-like texture.
The first dildos were made of stone, tar, wood, bone, ivory, limestone, teeth, and other materials that could be shaped as penises and that were firm enough to be used as penetrative sex toys. Scientists believe that a 20-centimeter siltstone phallus from the Upper Palaeolithic period 30,000 years ago, found in Hohle Fels Cave near Ulm, Germany , may have been used as a dildo. 
Check out some of our favorite household sex toys that, if used correctly (and safely), will give you a mind-blowing orgasm and leave you impressed with your own sexual ingenuity.
Just as it sounds, U-shaped double-ended dildos feature inches upon inches of dildo, crafted into a handy U-shape. "[They] are just what you need to satisfy your double-penetration cravings, whether you're playing solo or with a partner," says Cobb. This one is made of hypoallergenic, hygienic, and durable silicone.