I've seen Remington with both nude and clothed bathers, depending on who's there at the time. Little Caliente is fairly hard to access, so I'd imagine that it has a fair number of nude bathers, as there will be little company there.
Earlier posts suggest that the road to Little Caliente is currently closed, but there's a way to hike in. I wouldn't recommend nude-hiking that one, though, as there are portions of the hike that involve bushwacking through thick undergrowth -- ouch!