There were a lot of those things. And then I just asked for one, and she was into it, and she got braver and asked for things she wanted to do, and now it's 3 months later and we have tried out a lot of new things. And are both feeling super stupid for not having been confident enough to do this years ago.
Don't be us. You love each other, you trust each other, so just ask your SO. But ensure them that it's perfectly okay if they don't want to do it, don't pressure them. If they say no, at least maybe it gives them a little courage to tell you what they would like to try.
You bring up an interesting point in that the duration of the relationship may affect the reaction to the question. Maybe earlier in the relationship you're still exploring so the sexual expectations haven't solidified as much. On the other hand, maybe in a longer term relationship there's more trust. I'm not sure what the normal is or if it leans either way.