As far as I know, the only handcuffs available to characters are fuzzy pink fake handcuffs that can be removed by absolutely anyone including the person wearing them.
Which is kinda lame. The only other cuffs in game are illegal and unremoveable.
It would be cool if we could get a more expensive set of handcuffs that could be removed by anyone who wasn't wearing them, or with a code/key.
Also be swanky if there was a 'resist' command similar to grapples that could break the cuffs.
I also heard there were gags available IC, but in over a year of playing I've never seen one. That coupled with a hood to remove a players vision could make for some awesome abduction role play.