@Kirin-kun She probably have a lot of second hand experience and stories from her friends on the brothels. The papers might have been a lot of stories about how they deal with different men.
I mean, she worked in a brothel, so not only she heard the other girls talking about sex, they probably teased her, and she also probably witnessed some interesting stuff.
"Please refer to the emperor for impressions", mouahaha ! 🤣