RandyGal, I did not read the thread very thoroughly, but I think nobody had one certain idea: How about not asking him? At the next opportunity smile at him and take his hand to the places you want to? (But first read below)
Reading about his behaviour I have an idea what is wrong with him: It is possible that he is a lot of embarrassed doing more than the classic stuff, and still more embarrassed talking about sex. Are you sure he is completely open with you or is it possible he has things he does not want to talk about for his embarrassment?
Perhaps instead of talking about sex you could carefully ask him if it is difficult for him to speak open? Try to find the reason why he does not want to talk and show him that there IS no reason for being embarrassed.
Besides that: if you cannot get a result perhaps you might ask for professional help?

Wish you all the best, Stefan

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If every material thing is gone, my smile and my tears stay left.