At the beginning of the 20th century, when women were legally "allowed" to study at German universities, it was customary, with very few exceptions, for a professor not to begin his lectures if he detected the presence of a woman in the classroom. It was a perverse form of discrimination, since most of them ended up leaving the classroom.
– https://www.enriquegracian.com/emmy-noeteher/
Translation from Spanish courtesy of DeepL (deepl.com).