Same here. I've probably applied soap to my body a handful of times in the last 40 years, apart from handwashing or after camping trips when I'm caked in mud. Shampoo needs depend very much on the environment. I worked ina rainforest reserve for a year and experimented successfully not using shampoo. Back in London my hair needed shampooing again.
My wife would also relish enumerating the various stenches that my stink could surpass at that moment.
Usually, I just get "you smell buttery", and that does not seem from context to be any sort of objectionable smell.
But when it comes to smells, it would be better to rely on someone not already habituated. You almost have to walk up to a complete stranger and ask their opinion.
My wife would certainly tell me if I ponged.