You sort of made this up. There's no way to know that the first man did. — Hanover

I see where you would think this... that I 'made it up'... but that's only if you are thinking factually about the details of 'what happened' at a certain moment in the distant past. Of course these details can not be known. But my reasoning here is not factual. What I'm looking for is not the first words 'in fact' but rather the 'first principle' of human language.
As for the 'first copulation'... well, that's hard to say indeed since, unlike with language, there is a very indistinct line between the animal version and the human version... maybe very little distinction at all in fact. That's where humans return to their animal natures and become, for better or for worse, 'speechless'.

Sure... Please see:

As the names of things proliferated, language was required to comprehend the nuances, actions and interactions of things as well as their relatively static, nominal state of being. Thus developed the need for verbs, adjectival and adverbial expressions and well as nominal ones. — Mark Aman

Pick and drag your mouse over the text you want to quote. It becomes highlighted, and a small box labelled "quote" appears near the highlighted text. Pick the box labelled "quote". The quoted text then appears in the input field at the bottom of the web page.
There are other ways, such as: copy and paste text into the "Quote" menu item above the input field. Hope this helps. — Galuchat

Thanks!

I'm new to this. Could someone tell me how to quote a person within a post like Banno and Apokrisis did with my quotes above. I can't figure it out. Thanks.

I agree that I'm oversimplifying the discreet 'nominative' aspect of language to make the description more understandable. These 'first words' were certainly a social event that would naturally lead to agreement and common action in a shared world. However, in order for there to be any mutual 'understanding' of the meaning of these words, the newly minted 'thing' that the word represents must be assumed to exist precisely 'not here' and 'not now' but...