How was sexual intercourse referred to before 'sex'?

It seems that the word "sex" in the context of sexual intercourse is a fairly recent development. How would sexual intercourse have been referred to before the 1920's? Coitus? Is there a more casual word, or was the word 'coitus' casual at the time?

Fuck, from the 16th century.

Roger, from 1711.

Screw, from 1725.

Shag, from 1788.

What a great question.

How about knew, as in the Biblical sense as here in Genesis 48 38, verse 26 (the earliest usage in Genesis (King James Authorized) that I could find):

And Judah acknowledged them, and said, She hath been more righteous than I; because that I gave her not to Shelah my son. And he knew her again no more.

Here at Collins online dictionary is a definition:

9.(archaic) to have sexual intercourse with

Alternatively, up a few verses in verse 16 we have the phrase come in unto me used thus:

And he turned unto her by the way, and said, Go to, I pray thee, let me come in unto thee; (for he knew not that she was his daughter in law.) And she said, What wilt thou give me, that thou mayest come in unto me?

In some archaic literature, "to lie with" would denote sexual intercourse. This gave rise (excuse the pun) to the modern colloquial "to get laid."

Please see http://www.thefreedictionary.com/lie+with

Fornication

Fornication typically refers to consensual sexual intercourse between two people not married to each other [...] The word derives from Latin, fornix meaning "arch", supposedly as a euphemism for "brothel". The first recorded use in English is in the Cursor Mundi, c. 1300; [...]"Fornicated" as an adjective is still used in botany, meaning "arched" or "bending over" (as in a leaf). John Milton plays on that and its sexual meaning in The Reason of Church-Government Urged against Prelaty (1642):
"[She] gives up her body to a mercenary whordome under those fornicated [ar]ches which she cals Gods house."