Fleshlight 

The Fleshlight has been hailed as the ultimate male masturbation toy by those who know best—men who've used it. The Fleshlight is basically a penis sleeve—a tube intended to recreate the feeling of a penis in a vagina—but this one does the job remarkably well. The reason is a special material (commonly referred to as cyberskin), which feels an awful lot like real skin.

The Fleshlight is a big, plastic canister that holds a generous, silky-soft pipe of cyberskin, and has an opening shaped like a mouth (or in some models a pussy). It looks like an oversized flashlight, so the bashful masturbator can hide it in plain sight.