No. Like any tool, spreader bars are as dangerous or as fun as you make them! Remember the safety advice included above, do as much Internet searching, reading and of course, ALWAYS talk with your partner ahead of time, communicate during and remember after care afterward! Reddit has some great BDSM communities where you can ask questions, as do FetLife and Twitter. There are no dumb questions when it comes to practicing safe, sane, consensual BDSM.