i have. what i have done is while doing it i will look at him and say "sweetie i really think we might like this new position" then before he has time to argue get into the position and if he really doesnt want to do it he will say so and with out argument go to another position. OR if you dont want to ask then while your goin at it or right before hand just get into the position. since I dont know what positions they are I cant really say what will be easy. Another thing you can do is before sex ask what he will like to try, come up with some things before even going to bed, then make sure you tell him what you want to try. If anything tell him youll try one for him if he does one for you. Hope this helps you.. If i think of anything else i will post it. IF you want to you can PM me anytime you can
Hopes for the best,
sarriah

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"No lover is worth your tears, and the one that is will never make you cry"