Princess: an effeminate and relatively youthful male homosexual or lesbian (1931-4)
Daffodil: effeminate young man (1925)
To throw a fuck into: to have sex with (1919)
Top sergeant: a masculine lesbian (1939) [‘she takes command of the girls’ privates’]
Wolf: sexually aggressive man (1847); a homosexual top (1918)
Soul kiss: a deep kiss, involving putting one’s tongue into one’s partner’s mouth (1907)
Tom: a lesbian (1909); [in 'old tom'] prostitute catering to lesbians (1966)
Church mouse: a male homosexual who frequents crowded churches in order to fondle any potential sex partners. (1941)
Discover one's gender: to accept or acknowledge one’s homosexuality (1941) / Lose one's gender: To return to living as a heterosexual
Minty: a masculine lesbian (1941)
Also a lot of early 20th century vulgarity is recorded in Letter from My Father, which is a collection of letters published by a man who's dad was, in short, a major slut and human disaster who wrote about his sex life for his son. It's insane. You can find copies of it online & it's a wild fucking read (literally!) and I think a really interesting look at the life of a person who goes against our stereotypes of what people in the past were "supposed" to be like.
Anyways feel free to add y'all's favs to this post. & if you use this for gay historical fanfic please share with the class