My Fetish Is His Fantasys

I get turned on hearing about my husbands sex fantasys and pretending that we'll start doing them. Threesomes, swinging, public sex, pissing even me taking 3 guys at once. I know I'd probably love it and I'm quite sexy so they'd enjoy me but I have no interest. I could tell him and it would probably hurt him.
I want him to keep thinking of new things that I'll never do but he's going to work it out eventually.