I was reading this excellent article about the history of sex ed in the United States, and came across this vaguely horrifying metaphor for male sexual energy.
“The Science of Life” even had separate segments meant for boys and girls. Part of the boy’s section voice-over states, “The sex impulse contributes to those masculine qualities which make men ambitious to strive and achieve. Controlled, the sex impulse, like the horse, may be a source of power and service. The sex impulse is like a fiery horse. Uncontrolled, it may be destructive and dangerous.” “The Gift of Life” warns, “Masturbation may seriously hinder a boy’s progress towards vigorous manhood. It is a selfish, childish, stupid habit.”