I voted hand cuffs because I assume you meant all wrist restraints. I love to have my boyfriend restrained.
As for me, I just prefer much of any traditional vibe. That wasn't an option, so I chose 8 inch hard plastic vibe. I rarely do any insertions so it works just fine for me. It makes me sad that I haven't tried all of the choices up on there yet.
I was surprised that non-vibrating, non-realistic dildos were the favorite. I always thought they'd be pretty boring to use. Huh. Guess I'll have to try it now.