The paper discusses the unusual interaction between ducks and human anatomy, specifically addressing the consumption of penises by these birds. Although it does not offer a precise figure on how many instances of such incidents have occurred, it suggests that the frequency of these events is significant enough to lead to a humorous saying among people. This phrase reflects the peculiar nature of this phenomenon.

Mary Roach's book, "Bonk: The Curious Coupling of Science and Sex," highlights the intersection of biology and human sexuality through various intriguing anecdotes. By incorporating this saying, the author emphasizes the oddities of nature while prompting readers to consider the unexpected ways animals interact with human bodies.