Yes, using sex toys is considered "normal behavior." Personally, I
don't like using that expression because it is so subjective and judgmental.
If you and your partner are comfortable with a behavior and you are not
hurting yourself or others, it is usually okay.
You might want to discuss with your wife what her real objections are. Is
she just not interested? That is okay too. On the other hand, if she is
curious, but doesn't want to be seen as a "freak" then it might help
her to know some statistics.
Some of these data are a little hard to come by, but in the handful of
studies done, it was found that over half of all people who have ever used
a sex toy were first introduced to it by a partner, or bought it themselves
for use with a partner. In fact, it appears that a substantial percentage
of the population has at least tried some form of sex toy, and many continue
to use toys alone or with a partner.
I should mention that in these studies, the definition of a "sex toy"
was fairly broad. In fact, it is possible that what your wife is thinking
you are in interested in is far more extreme than what you imagined.
Perhaps it might make sense to start with a "sex toy" like massage oil
or lubricant, or maybe a furry glove, before moving onto anything else.
The point is for both of you to have fun!
