In theory, almost anything can take the role of a "sex toy." Other than two human bodies, anything else introduced into sex play qualifies as either prophylaxis (contraception and disease prevention) or recreation, i.e., a toy. For our purposes, a sex toy is any object brought into sex play to enhance the pleasure of both people involved.
There was some debate as to the question "what is a sex toy?" for the purposes
of this FAQ. Some argued that this FAQ should cover those items that are only
specifically for sex, whereas others rightly pointed out that that would exclude
from discussion some very popular forms of sexual enhancement such as lingere'
or food. For our purposes, a sex toy will be anything that is either specifically
intended for sexual enhancement or commonly used for same. We're sure there
are people out there that find mountain goats, hand puppets, and Un*x System
Administration manuals suitable for sexual enhancement, but that's not "common."