My aspie now-husband said something like:
I'm overwhelmed in really loud places and I would like to spend more quiet time with you alone. How about I cook dinner for you?
I think Lene's right - - go somewhere really quiet, candlelight and low sound / low crowd.
I now look back and realize with my husband, it wasn't just the physical stimulation. He was also terribly nervous to even be there and wanted to be in his comfort zone (home). He's a great cook,so it was lovely for me.
Good luck! Remember he may be just as nervous as you.
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Happy and loving my AS/NT marriage.