"Of course, some body hair is helpful to humans; eye brows can keep sweat out of the eyes and facial hair might influence a womans choice of sexual partner. All the rest of that hair, though, is essentially useless. "
I just read about the lactation, means your friend has too much estrogen which means he in turn has too much testosterone which is then converted to estrogen by aromatase. He might be on 'roids or is just more of man than I ever hope to be.
Humans still have gills too The passage that equalizes pressure between the ears and the nose originated as gills in the lungfish we're originally descended from.
I was taught Eustachian tube, but yes the passage linking the middle ear and pharynx - it is derived from the gill cleft found in fish. The spiracle of early fish (i.e. remnants of the first first gill slit) is still found in human embyos, and a modified version develops to create the Eustachian tube.