Reddit mentions of The Descent of Woman: The Classic Study of Evolution

I have read her book The Descent of Women. She makes an interesting case.

If early humans' habitats were the medium to shallow areas of large bodies of water, it would explain a lot and Elaine Morgan had some very interesting perspectives. These are not all of her theories.

Our noses seem to be designed to prevent water from entering it when swimming or diving. Chimps and other primates noses are NOT designed for this.
The hair on our bodies seems to grow in patterns that offer the least amount of drag when swimming.

We have a subcutaneous layer of fat, somewhat similar to other water dwelling mammals.

Women have distinctive breasts while other primates do not. Supposedly this makes it easier for human infants to nurse while in the water with their mother.

Women rarely go bald. Long hair floating around the mother makes it easier for the young to cling to her. Men, not generally the primary caretakers of infants, do not need long hair to support their aquatic children, so they are more likely to go bald than women.

Our exquisite sense of touch in our fingertips enabled early humans to feel the bottom, distinguishing shellfish from rocks by texture.

The skin on our hands and feet are adapted to a partially aquatic lifestyle.

We evolved an upright stance because when chased by predators, we could run into deep water, stand up and wait out the predators on shore.

*Women are generally more highly evolved than men, particularly when it comes to sex. She explains her theories about our placement of our reproductive areas and organs and has theories on why we orgasm the way we do.

It has given me much to think about over the years. [I am a woman]

This book from the 1970's argues that many human traits are adaptations to a semi-aquatic life style. Proto-humans needed long head hair for kids to grab while mom is in the water.