Engaged But Still Curious...

I never thought I'd ever be this honest about it... but here goes. My fiancé is amazing in every way, and we've been happy as can be. Lately though, something's gnawing at me... I found myself browsing adult content online the other day when I was supposed to be working on wedding plans... A specific type of content actually, stuff that isn't exactly mainstream but has always intrigued me. It’s not like I want to do it or even have talked about it with my fiancé... I just can’t shake this curiosity... and I’ve never felt so guilty before. Am I cheating on him by thinking about others? Should we talk about expanding our comfort zone?...