UPDATED INFO IN
BOLD GREEN:
The story (TOS - don't remember if it was before or after TMP) involves a shore leave where one of the crew (can't remember if it was Bones - probably Bones by way of a no-name crewmember) tells Kirk he needs to go see this "show" (and to bring Spock). The show turns out to be based on the rumors of Kirk and Spock being lovers (with 23rd century porn stars playing the parts). The actors engage in some overly rough sex (some of which is faked for effect). The whole time watching this (from a private viewing booth) Kirk is getting increasingly uncomfortable - thinking how he's going to shut it down to protect Spock, how he wants to get Spock out of there - but is afraid to move & Spock doesn't move or say a word (
but Kirk notices that Spock is very aroused). By the time it ends, Spock storms out in a rage, nearly injuring the "doorman" (who didn't realize it was a Vulcan under the cape/hood). Kirk follows and gets back to the Enterprise -- Kirk walks in on Spock who was about to kill himself (?) with a dagger.
Kirk stops him with a phaser stun (lowest setting - Spock is still conscious and aware, he just can't move or speak for a while leaving Kirk the perfect opportunity to 'take action').I also just remembered that in the end and they're happily together, a crewman sent by Kirk to get all copies of vids made of the show brings them back. Kirk suggests to Spock they keep one as a reminder of what brought them together. Spock tosses it saying reality is far better than the vid.
I remembered more stuff and darn it all, found what I was looking for. First, the story is "Fantasies" by Beverly Sutherland and it was in Nome 8 - here is a link to the full description of the story (from a summary of all the Nomes and their respective tables of contents).
Now, can anyone tell me where I can get a copy of this story by itself, Nome 8, or The Best of Nome #1?