Dildos come in a wide array of materials from silicone, to glass, metal, jelly, and thermoplastic rubber, not to mention several branded “realistic feeling” materials. Different materials are great for different purposes and some need extra care and caution.
Rubber: This latex material is commonly used to make dildos. It has a pungent odor and can cause allergic reactions. It has a pungent odor and can cause allergic reactions. If you buy a rubber sex toy, be sure to use it with a condom because it is porous.
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Latex rubber is one of the best dildo materials for “stiffer” toys like dildos and some vibrators because it is firmer but still bendable. Similar to jellies, rubber-based toys are usually inexpensive.
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. 
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.
Jelly Sex Toys. Jelly material is just about the cheapest material when it comes to sex toys. And as you may have guessed, it almost always comes with tons of phthalates. The material uses rubber as a baseline, and adds phthalates to make it flexible. As a result, jelly sex toys can easily be made into any shape (and color).
So, even though Fine says phthalates (and PVC) are much less common in sex toys nowadays, look out for toys that say phthalate-free and are made of silicone or other non-plastic materials.
** Silicone is the only non-porous material that’ll be able to be made into realistic dildos (such as flesh-coloured dildos). So if you’re buying a realistic dildo, it’d better be silicone. Think Tantus , Vixen Creations , We-Vibe , and FemmeFunn .
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.
In my opinion, silicone usually makes the most realistic dildos, the most smooth to the touch and the most life-like dildos. One of the most important factors in dildos is the material. If a dildo is made from cheap rubber or even plastic, then it just won’t feel realistic, no matter how good the design is otherwise.