I don't, either - but I do notice it after I've done something athletic, or I haven't showered in 16 hours. I don't think it's because I'm desensitized. A shower and a clean change of clothes fixes that right up.
As an alternative, there are milder ways to wash your hair, the main thing is to not strip out all the oil from it.
For the the shower with no soap, is it really just water that cleans you off? I'm intrigued.
It still does, when I fail to shampoo and conditioner on a daily basis.
Yes, I shower without soap. I guess there's some trickle-down of shampoo, but it's not a major contributor. Hot water and light scrubbing cleans me off. If I am exceptionally dirty, I will use soap, but because I don't work outdoors, that rarely happens.
Obviously, I always wash my hands with soap.
My wife is a PE teacher and is quite physically active and it is perfectly fine.