During winter understandable la. You barely sweat even with room heater on in the room as long as you don't do activities. You clothes will barely smell.

Not really but cold weather make you not want to go out and just stay indoor.

Got something to do, like studying, cooking. Clean the room not so much sweat since small room. Kitchen got cleaner coming oven to help clean. If I do sweat and start to smell, of course la that time will take shower but its not like everyday have to do much cleaning.

Its not even my habit to go long days without shower since I'm twice a day shower but that habit completely change in a cold climate country.