Toys normally are broken down to insertable and not. Any toy that I buy or make that goes into her body is hers and no one else's. I tend to make cuffs for each submissive that agrees to serve me long term and they are her's because it is my custom to give them to her. Chains, rope, are mine. I love a couple of types of vibrators so the moment they enter her they become hers even if I keep them with me they will not be used on another.

So the answer to your question is really it depends on the pairing but never allow an insertable toy to be used on you if it has ever been used on another. Normally when I buy a new insertable toy I show her that is just now coming out of the packing.