In her book "Stiff: The Curious Lives of Human Cadavers," Mary Roach discusses various intriguing aspects of the human body, including its anatomy during sexual activity. A noteworthy finding from researchers highlighted in the book reveals that the penis assumes a boomerang-like shape during intercourse, specifically in the missionary position.

This observation underscores the complexities of human physiology and how different activities can affect bodily shapes and functions. Roach's work often blends humor with scientific fact, providing readers with a fascinating exploration of the human experience. The insight into sexual anatomy not only adds to the understanding of human intimacy but also illustrates the unique characteristics of our bodies during such intimate moments.