In my case, I would normally take a shower every day. A few years ago, when I was single, I showered twice a day sometimes. But now, the act of having a full time job with overtime (I'm out 14 hours a day), and trying to balance out time for my marriage, and my kid... well, what do you skip out on? I even use the bathroom at work for the majority of my ahem... other things that take more than five minutes.
Usually, my showers are 15 minutes, and the entire process of showering, drying off, and putting on clothes takes a half hour. Without a hot water heater, it takes 2-3 hours to boil enough hot water to wash and rinse my hair.
So for me, the lack of showering is due to a balancing act and unfortunate circumstances. When i was in college, I had no excuse. I was just a dirty guy with greasy hair, and I didn't know I was dirty until facebook was invented, and pictures of me started popping up here and there.