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I have a terrible, but serious question and I hope someone can help me.

I speak using several obsolete terms, today's case:

ejac ·u ·late verb \i-ˈja-kyÉ™-ËŒlāt\
medical : to release semen from the penis
: to say (something) suddenly and forcefully
[http://www.merriam-webster.com/dictionary/ejaculate…]

So when you yell, "Ouch," you're actually ejaculating. But this got me on a bad roll.  

Origin
late 16th century: from Latin ejaculat- 'darted out', from the verb ejaculari,  from e- (variant of ex-) 'out' + jaculari 'to dart' (from jaculum 'dart, javelin',  from jacere 'to throw')

Word origins are fascinating. But wait....late 16th century? No one ejaculated before say, 1550? What did people do before then?

Let's try:

cum
verb and noun, by 1973, apparently a variant of the sexual sense of come thatoriginated in pornographic writing, perhaps first in the noun sense. This"experience sexual orgasm" slang meaning of come (perhaps originally come  off) is attested from 1650, in "Walking In A Meadowe Greene," in a folio of  "loose songs" collected by Bishop Percy.

They lay soe close together, they made me much to wonder;
I knew not which was wether, until I saw her under.
Then off he came, and blusht for shame soe soon that he had endit;
Yet still she lies, and to him cryes, "one more and none can mend it."

As a noun meaning "semen or other product of orgasm" it is on record from the 1920s. The sexual cum seems to have no connection with Latin cum, the preposition meaning "with, together with," which is occasionally used in English in local names of combined parishes or benifices (e.g. Chorlton-cum-Hardy), in popular Latin phrases (e.g. cum laude), or as a combining word to indicate a dual nature or function (e.g. slumber party-cum-bloodbath).
[http://www.etymonline.com/index.php?term=cum%5D

Well, poo. That's even more recent and not helpful. How about this?

semen (n.)
late 14c., from Latin semen "seed of plants, animals, or men; race, inborncharacteristic; posterity, progeny, offspring," figuratively "origin, essence,principle, cause," from PIE  si-so-, reduplication of root  se- (1) "to sow" (cf.  Latin serere "to sow," Old Prussian semen "seed," Lithuanian semens "seed of,"  Old Church Slavonic seme, Old High German samo "seed," German Same; see  sow (v.)).  [Same Site as Above]

Well, that's 1375, but it's from Latin. I'm unsure exactly how much Latin the common person understood or spoke. I am led to believe that a majority of people at some time did not understand the Latin mass, but I'm unsure the date. However, I'm willing to bet that that the guy on the street was most likely not using Latin to name his semen.

After searching around a bit, I have nothing conclusive. I'm thinking that this is likely one of the things lost to the annals of time, but I thought I'd ask the wise listeners if they're familiar with anything.

Thank you.