One of my friends told me he stopped using soap years ago and I never smelt anything bad. I wanted to test it and changed my shower routine to just warm water and thoroughly using my hands to scrub my body. The results were amazing, I didn't notice any increase in odor and showering took less time.
In fact my body odor seems to have decreased significantly. So much so, that after days where I don't sweat a lot I frequently skip showering entirely without any bad effects. And it's not due to not being able to smell myself as it has been confirmed by my partner.
I still wash my hands with soap to prevent the spread of disease. And I can also understand the use of soap if you get so dirty that water alone doesn't get the grime off.
This is why I'm curious if there is any evidence that using soap on the body does any good? Or do we just do it because everyone has been drilled since childhood with the belief they would be dirty without soap?
Maybe cosmetic companies spread this idea to sell their perfumed soaps? Their commercials certainly keep it alive. Interestingly I'm now much more aware of the perfumed odor emitted by people who use a lot of soap, sometimes it's even somewhat repelling to me.