When you tie a woman to a chair it can not be to have sex with her . Or to stick anything in anywhere. So a woman tied to a straight backed chair is more of an object of art. Bondage in it's truest form. Either that or you are a bugler robbing the house.
Now if she happens to be sitting on a vibrator, all of this changes. Now it is an act of love. A delicious torment.
Having waxed poetic (creepy sorry) Let me say "Please be patient" There really are not a lot of good pictures of women tied to chairs out there. I am working on it.