Can Anyone Relate?

I'm in my thirties, been with my partner for years now, but recently I found myself drawn to this other guy who has this... unique taste. We did something together that's not exactly what we usually do, nothing too extreme mind you, just exploring different sides of ourselves. Felt really good at the time, more alive somehow, but afterwards? Just felt ashamed and scared. My partner doesn't share these interests, so I know it'll never happen again. But still... can anyone out there relate to this feeling? Am I the only one who sometimes wants something a bit different in bed?