Sacrifice to Cybele
"Another makes the sacrifice of his genitals; appeasing the goddess by mutilating
his loins, he unmans himself and offers her a shameful gift; the source of the
man's seed is torn away to give her food and increase through the flow of blood.
Both sexes are displeasing to her holiness, so she keeps a middle gender between
the two, ceasing to be a man without becoming a woman."
(Prudentius, Perist. 1059-1073)
>https://journal.fi/scripta/article/view/67211/27509
Rings a bell on so many levels