Ok, I'll admit, I often go several days without a shower. But I always use deoderant, and even carry a spare thing of it in my laptop bag at work. I brush my teeth every day.
There was a time in my life where I showered everyday, but after I got married, and had a kid, I just don't seem to have time for that. I wake up, get dressed, brush my teeth, comb my hair, do all the little things, and head to work. My wife is the same way. We're just so busy with the kid, and with life, that we just don't slow down to shower as often as we used to. It's just not a priority for us. And my wife has a nose like a bloodhound. She'll let me know when I stink.

In our life, sleep is more important than being squeaky clean. And it's not like I have a dirty job. I sit at a desk all day long. I rarely ever break any kind of sweat.
But yea, you need some kind of like once every 2 days or once every 3 days option. I'd be closer to those. I voted 1/week just to skew your results!
edit: at Gen Con, I'll shower every day due to all the walking I'll be doing.