Depends on what I'm doing and where. Have gone skinny dipping many times when the day is warmest. Like has been said, you must keep up the feet and both sides of the butt.
If it's really cold, I go with OK's system. Do a half at a time, and preheat the water.
I insist on doing not only the crotch, and feet, but the pitts and my neck as well.
All in all, the best way to do an extended hunt in really cold werather, like Montana's elk season, is to camp out in a fully equipped RV. A hot shower every night, hot food at breakfast and dinner, and sleeping in clean sheets at night.
Just make sure you get one with a built in generator and has a forced air system that keeps the pipes and holding tanks from freezing. I use a Lance truck camper to this. E
