OH has dry ear wax and has stronger BO than me when he's been doing sweaty hard work. I have wet wax and only suffer with BO pre-period and when I've been sweaty.
Keeping clean is one of the most important things you can do to stay healthy. I worked in a hospital and would see people with poor personal hygiene succumbing to bacterial skin infections far more often than those with good hygiene.
I'd also see a difference in the infection rates of surgeons that would insist on a pre-surgery routine of 5 days of Hibiscrub etc., to those who didn't. If you need surgery and your surgeon insists on this, he/she's a good one.
I've suffered major depressive episodes in my life and have gone several days without washing my hair, but never more than every other day in the shower - and then had clean clothes on every day. I know I'd have felt worse if I hadn't kept clean. Even when I had flu in my twenties I managed a wipe-down bath sooner than I'd have managed the proverbial pick-a-tenner-up.
I'm now disabled and showering is difficult and hard physically for me, but I still do it almost daily and use a bed bath no-rinse, wipe off foam while sitting on the loo on rare "can't manage a shower" days.
People who can't be bothered to keep clean through laziness freak me out. I'm glad I no longer have to suffer people who smell so bad that they've made me feel physically sick when they've undressed for an exam - thankfully rare, but an absolute dread of mine.