How do I ask?

M • Loving life! ❤️✌️
Ok so I'm not Christian Grey or anything but I do like when things get a little rough in bed...my husband on the other hand is pretty straight laced with that stuff and other than trying some different positions isn't very adventurous sexually. He more than takes care of me, that's not the issue, but I would like to at least occasionally spice it up a bit! Im not afraid to ask him for these things, I've mentioned using handcuffs or blindfolds etc. before, but his response was "that would make me feel like a rapist!"...
So how can I gently ask him to be a little more wild without freaking him out too much? I just need some insight on a different approach, please no nasty, mean, or rude know-it-all comments...thanks!