Here’s an article from Elite Daily that asks,
You probably shower daily, but is it really necessary? If you’re talking about protecting yourself from illness, it’s not. Sweat itself is sterile, and doesn’t stink. Your armpits get smelly because your apocrine glands (located under your arms and in your groin) release sweat that mixes with the bacteria on the skin, creating an unpleasant odor. So the short answer is, if you’re a person who has less bacteria on their skin you can wait longer than everybody else to take your post-workout shower. Eva Glasrud, a psychologist explains, “When you shower, basically nothing happens. You wash away sweat and dirt, but the bacteria count on your skin doesn’t really change. Hence, you feel clean, but, biologically, you’re the same.” Additionally, Lynne Goldberg, a dermatologist and director of Boston Medical Center’s hair clinic, told Business Insider that washing your hair too much can strip your luscious locks of oil and dry out your scalp.
I shower every other day because showering every day isn’t good for you skin because it strips your skin of the natural oils that it produces.