I don't mind being smelly; it's part of the backpacking environment! However, I do mind when I develop fungus in various skin-fold areas after several days of not washing. I also have to clean my nether regions daily due to a couple of medical conditions that would become serious if I didn't do so. I therefore carry diaper wipes. If used daily, a single wipe suffices to clean both the skinfold areas and the nether regions, and prevents both the fungusamongus and infections due to the medical conditions. Of course the used wipes are packed out!
I also have been known to take a quick sponge bath in the tent if I get uncomfortably sweaty. I'm just not brave enough to jump into a COLD mountain lake or to endure the bug bites I receive while trying to work up sufficient courage!
Feet, of course, are a special case, and I do dunk them in the creek every evening!
I do leave water, a washrag and hand towel and more wipes in the car at the trailhead so I can remove the worst of the dirt/stink before heading back to civilization.
Re shaving body hair–not a good idea! As any woman who went through childbirth in the bad old days can tell you, it itches like crazy when it's growing back in!