How do I (29F) get my (30m) to fuck me harder?

My boyfriend (30m) and I (29f) have a pretty good sex life—we do it often enough, and he always makes sure I get there. I love that he treats me like a princess in bed, but sometimes I crave something more intense. I just want him to go harder, really let loose, instead of the usual gentle thrusts. I’ve tried asking him to be rougher, but he still keeps it pretty soft and sweet. I’m just looking for that extra intensity every now and then. How can I get him to fuck me harder?