Okay, I have totally been neglecting my actual fandom. Here is a wonderful Gayle F piece from 1981. It’s the cover of a (het and gen) anthology zine, The Captain’s Woman #3 but is wonderfully K/S-y <3
And my Gods, the geometry.
Enjoy, everyone, and remember you can learn more by clicking the bolded words for links to their respective articles on Fanlore.org, the best place to learn about fandom history as a whole, and fanzines in particular.
No single character anchored Star Trek; two did. Almost from the very beginning, the chemistry between Kirk and Spock defined the show in a way that made it impossible to have one without the other.
“I designed Kirk and Spock to complete each other— And, in fact, the Kirk/Spock/McCoy triad proved to be the dramatic embodiment of the parts of one person: logic, emotion, and the balance between them,” Roddenberry said.
It was this interdependency that made the death of Spock arguably the most unexpected, dramatic and emotional sequence in the entire franchise. The protective screen dividing them becomes a metaphor for not only the lines between life and death and human and Vulcan, but also for a heart broken in two. As Kirk slumps to the floor next to his fallen comrade, he too is dying.
Star magazine’s Into Darkness special, “The Top 100 moments of Star Trek” (Emphasis mine)
The classic fannon that was thoroughly adopted and turned up everywhere was the ‘double ridged’ penis. That is, Spock’s glans had a, er, kind of double echo thing, another set of ridges just underneath. A subtle nod to the alien penis and the fans’ love affair with same.
I’m pretty sure there were a load of self-lubricating penises in the stories - because you could so totally get away with that in fandom. And why not? A self-lubricating penis is logical, dammit, Jim!
There was one story (sadly, I never found this one, only heard about it in horrified whispers from friends) where Kirk had been raped and had developed a fear of penises (other people’s, one assumes, not his own), but that was just hunky dory as Spock didn’t have one. He, instead, had a hundred tiny tentacles that all sort of came together to do the job. How perfect is that? I wish I could find that story, because it’s just like mini-hentai! Hundreds of tiny tentacles! Adorable! Although I think it would make giving Spock head an adventure in eating spaghetti. “Hey, Kirk, you want parmesan on that?”
Oh, and there was this really great novel, I forget what it was called, but it was huge, where Spock’s nuts were on the inside. In fact, he may have had a couple of sets… no, wait, I remember, his nuts where accessible from the back, like, um, near his kidneys or something, so he really, really enjoyed massages, and then his scrotum just filled up with juice prior to coming. Or something. Anyway, it was hot. Back nuts.
My absolute favourite, though, was the extreme alien penis presented by Leslie Fish (Ah, Leslie, your zines are still my sugar bunny comfort fic). Spock’s genitals could best be described as a kind of hairy orchid. When he became aroused, the petals unfolded, revealing a studded (with emeralds) green shaft (again, ribbed for Kirk’s pleasure!), and two little whippy tentacles that just joyfully joined in the fun. 
|—||by iibnf from Different Shapes and Sizes under Vulcan Genitalia (2007)|
This is from the era of fanzines and anthologies that shaped the way we behave in fandoms today.
Henry suggested that slash addresses some of the social forces which block intimacy between men:
“When I try to explain slash to non-fans, I often reference that moment in Star Trek: The Wrath of Khan where Spock is dying and Kirk stands there, a wall of glass separating the two longtime buddies. Both of them are reaching out towards each other, their hands pressed hard against the glass, trying to establish physical contact. They both have so much they want to say and so little time to say it. Spock calls Kirk his friend, the fullest expression of their feelings anywhere in the series. Almost everyone who watches that scene feels the passion the two men share, the hunger for something more than what they are allowed. And, I tell my nonfan listeners, slash is what happens when you take away the glass. The glass, for me, is often more social than physical; the glass represents those aspects of traditional masculinity which prevent emotional expressiveness or physical intimacy between men, which block the possibility of true male friendship. Slash is what happens when you take away those barriers and imagine what a new kind of male friendship might look like. One of the most exciting things about slash is that it teaches us how to recognize the signs of emotional caring beneath all the masks by which traditional male culture seeks to repress or hide those feelings.” — Henry Jenkins, “Confessions of a Male Slash Fan,” SBF 1, May 1993
|—||“Did K/S Save Trek Fandom? (quote from 1984)” from Kirk/Spock on Fanlore|