Sweet dreams

I have constant dreams of watching my S/O with other people. And it turns me on to just even think about it. I’ve discussed it briefly with my partner but they don’t seem as interested as I am. They basically said they would be up for a 3 sum but even that hasn’t happened yet, and we’ve been together for over 3 years now. It’s frustrating that my partner isn’t as “freaky” sexually as me lol. But I obviously love them still. Any thoughts? What should I do?