I've never done this either, but I've recently been thinking about it. The only issue is that when we've been unable to have sex, it's hard for him to keep from cumming not long after we start. Might be worth giving it a shot though, especially if you start off with a lot of foreplay.
Sometimes. Usually it is regards to new toys. My BF pretty much always knows what I ordered but he also knows that I enjoy a little solo play first them before introducing them into "bedroom play". He actually enjoys the wait and the "torture" so to speak. I have also held out because things had started to become a little routine and let us focus on other things to build up the passion and excitement again.