Once upon a time in the modern sex toy industry, when making a sex toy intended for pleasure was a pretty new thing, there was not much choice for materials.  For vibrators there was metal or hard plastic and more refined since they could be sold as medical devices.  By the late 70's, dildos made of natural rubber (latex) were sold in sex toy stores (a very new thing) As toys rose in popularity and buyers became more sophisticated and comfortable expressing their feedback, the toy industry began taking big steps forward in materials.  You still saw metal and hard plastic, but a new soft rubbers began showing up.  Some of the first were not of the best quality, had unpleasant smells and textures, and possibly carried a health risk due to the manufacturing process. 

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Today's sex toy materials have come a long way.  Reputable manufacturers strive for optimal body compatibility and design in a variety of styles, prices, and functions.   What a toy is made of may be an important factor depending on what your individual requirements are.  Below are some common materials you will see in toys that are used for penetration or genital stimulation like vibrators, sleeves, and dildos.