This is certainly an interesting perspective. I have a friend that refuses to wear sunscreen because he feels like the risk to his health from rubbing all the "unknown chemicals" into his skin outweigh the health risk of skin cancer. While I still use sunscreen, his perspective did get me thinking about all the unknowns I've introduced into my body through the skin.

Logically, it makes sense that our skin can adapt to be less oily and odorous with taking a break from using a lot of soap. I've been only using shampoo to wash my hair every other time I shower and I've noticed that my hair now seems to take longer to get oily. It's basically the same concept as using soap on the rest of our skin.