I've been really trying to get my boyfriend to realize that our relationship is a bit too vanilla for me, but it really doesn't seem to be working

I said to him that 'I like it when a man takes charge and dominates me' when we were fooling around, and he went as far as to pin my arms above my head and that was it; it was fun, but there wasn't a word of it in the morning, I wonder if I freaked him out or something.
It seems he's not interested, but he does seem dominant in many ways, otherwise I wouldn't have said anything

It's all a bit confusing, but I'm really scared that I'm pressuring him a bit, and that's the last thing I want to do, because he's been so understanding with me and has been okay with me saying that we can't have sex, and we've been together for a year and a half now

Sorry if I'm babbling, I just don't know what to do, but I know I can't see myself being with someone in the long run with purely vanilla tastes