Handles of "regular" screwdrivers. Much better yet, the handle of a Black & Decker wall charged screwdriver, covered w/a condom. It is heavy enough to feel like you are really being penetrated, it has a nice texture, and has a good diameter. It's my favorite non-toy toy. Also, hairbrush handles. Chocolate syrup, whipping cream in the can, any strong breath mint candy (try oral sex w/one in your mouth or right after you've eaten one). Silk (or any lightweight material) scarves or something similar to use as a blindfold. Nylons to tie someone to the bed or to tie their hands together.

__________________
Communication is the key.