Personally I'll shower 5-6 days a week. Before I go out I'll shower to avoid making life unpleasant for those around me. If I'm just staying at home gaming/studying/being a lazy fuck or taking a five minute trip up to the supermarket I wont bother. Earlier today I was messaging one of my friends. An English translation of our conversation goes something like this: Her: Good morning Me: How are you today? I just got home. (some small talk...) Her: Have you showered yet? Have you had dinner yet? Me: I'm not hungry. I'll shower tomorrow. Her: What!? You don't shower in the evening? You're that dirty? (hygiene debate...) Up until now I've never given much thought to showering twice a day. I've never seen a reason to bother. As far as your health goes you only need to shower once or twice a week.