I have to wash my hair daily otherwise I feel absolutely gross, and I'll also wash the private and smelly bits daily with soap, but otherwise I only use soap head to tow twice a week.
My partners have never seemed to notice or complain about any off smells although I realize being around someone for long periods of time can desensitize you so I've taken a few opportunities to ask my parents who would certainly be the first to tell me if I smell like crap and they've never had any complaints.
Anecdotally, every partner I've had has told me I have great skin. Hair stylists have also told me I have incredibly healthy hair - I've been using cheap Suave Essentials (the clear baby blue bottle) shampoo with no conditioner since I was a kid.
https://www.google.com/amp/s/www.healthdirect.gov.au/amp/art...
Non AMP link: https://www.healthdirect.gov.au/anal-care
But seriously, an interesting topics. Thanks for the links!
I've never been a daily hair washer.
Or all over body soaper.
No complaints so far...
Last I heard there was some research on finding mixes of comensal bacteria that can replace the "stinky" ones. But currently, it's risky at best.
What I did get out of the experience is cutting on shampoo use. On hot summer days you can wash your hair as often as you want - but the extra washes should be water only, or at most conditioner.
I don't understand these magical unicorns of people who just stop with all soap and shampoo and come out looking marvelous. I don't doubt they're special but I don't know what makes me poorly suited. I get rank and my hair gets terrible dandruff if I don't persist with these surfactants. And trust me, I've tried for a long time, to the detriment of everyone around me.
They smelled very bad.
Also see lots of posts about Steve Jobs smelling bad
Of course if I do something strenuous at home and get really sweaty or dirty I will shower. There's no point in being disgustingly sweaty/smelly.