The Secret Companion is a medical work published in 1845 by R. J. Brodie and Company that focuses on the topic of onanism, also known as self-pollution or masturbation. The book provides a detailed analysis of the physical and mental effects of this practice, as well as the social and moral implications of indulging in it. The author argues that onanism can lead to a range of physical and mental health problems, including impotence, nervous disorders,...