"Cum" is the variant and "come" is the original.
Specifically, "come" has been used to refer to orgasm and ejaculation since the 17th century at the latest. Its first known use is in "Walking In A Meadowe Greene", from a folio collection of songs dated 1650:
They lay soe close together,
they made me much to wonder;
I knew not which was wether,
vntill I saw her vnder.
then off he came & blusht for shame
soe soone that he had endit;
yet still shee lyes, & to him cryes,
"Once More, & none can mend it."
And that's the first attested use, aka the first time it was undeniably intended to refer to orgasm in written form. It was likely in popular use earlier, whether in bawdy verse or dirty talk. One glance at Shakespeare's works, for instance, shows several heavy-handed contenders:
(from The Taming of the Shrew, Act II sc. 1, written ~1590. This is an incredibly pun-heavy scene where Katharina and Petruchio lob sexual innuendos at each other - a tour de force of linguistic double-entendres, where every other word has two or more bawdy meanings.)
(from Troilus & Cressida, Act IV sc. 2, written 1602. Is it possible the naughtiness is only the reference to her chamber? Sure, so it can't be seen as inalienable evidence of the sexual usage of "come" - but it's a strong suggestion that the word already was being played with in this register.)
Cum, on the other hand, is a much more recent variant. Its first attested usage as a noun is from the 1920s; its first usage as a verb from the 1970s. And while it's also very likely it was in popular use before then, that's still almost four centuries after the emergence of the sexual "come".
And it makes sense etymologically: to come is to "move with the purpose of reaching, or so as to reach, some point; to arrive by movement or progression". In the 13th century, it took on the meaning of "to happen or occur". It's a very useful catch-all term for the moment of orgasm, since it can refer to a) the successful completion of the act of sex, b) the eruption of pleasure, or c) ejaculation.
(Cum, meanwhile, is a Latin word that means with. You can argue that sex is a moment when people are with each other physically, but only if you purposefully ignore the existence of masturbation and solo orgasms.)
"Cum" was not changed to "come" by joyless, immature writers who can't appreciate its original, bawdy meaning.
"Come" is the original bawdy meaning.
Dirty euphemisms have a long, fascinating history in the English language. They're sly and funny, and they create connection between those in the know. They add ... tension. Potency. They form layers of meaning until the word feels charged with physical energy and breathless emotion. Maturity and immaturity crammed together into a tight space to create something hot.
You like "cum" best because it's filthier or sexier to you? Cool! Language is alive and fluid and evolves through usage; use the word that you like best.
You like "cum" best because you like to pat yourself on the back for edginess, and love to shame others as immature and joyless — yet you don't go to the minimal effort of basic fact-checking before you hit post on ur gross judgy little bullshit?
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