I think dragging is really the wrong word to use there. If she's your girlfriend, and loves you, then you should be able to be open with her, and communicate your wants and desires with her. If she doesn't want to even try (which is horribly closed minded but whatever) then that's that, move on, and concentrate on what you do both like. And if she says she's willing to try then take iot gently and slowly.

BDSM is all about communication, and if you can;t even communicate to her how you feel about things like this, then a BDSM relationship with her just wouldnt be possible.