@Cousin_Isobel The other tool is Google Ngram, but I don't really know what I'm doing 😁

I'm aware of language wizards using these to demonstrate actual changes in language, and slicing up results to show geographical trends and so on. I imagine there's a way to distinguish biological sex, sexual intercourse, gender role, gender-as-a-euphemism-for-sex, gender identity, but I don't know how.

https://books.google.com/ngrams/graph?content=sex%2Cgender&year_start=1900&year_end=2019&corpus=en-2019&smoothing=3