nether regions

While counting scales for his research, Fry says that, sometimes, the most informative areas are the ones closes to the snake’s nether regions.

Now he was ready for a different kind of journey, a psychedelic trip through the nether regions of his own mind.

If you weren't, then you can stick your opinions someplace where ignorance and information are equal, like the nether regions of Trump's mind.

Rodrigues blows past good taste with an explicit tête-à-tête in the scorched forest where his brave leading men pant racial slurs into each other’s nether regions.

From what I have gleaned from snippets of the book as reported plus interviews — perhaps not only were his nether regions affected by frostbite on his North Pole expedition but possibly his brain as well?