"Like a poor marksman, you keep missing the target!"
"From Hell's heart, I stab at thee. For hate's sake, I spit my last breath at thee."
"I don't believe in the no-win scenario."
That's some good shit right there. And despite my icon, I loved the friendship between Kirk and Spock. I've always loved McCoy, too, but Kirk and Spock were a beautiful friendship.
THOUGH, I did read a short story written in the 1970's called the Procrustian Petard where the Enterprise got stuck in a planetary trap and most of the crew were beamed against their will to the planet surface. Once on the planet, the crew were caught by machines and underwent through involuntary sex changes. Only the most "alpha" male didn't change sex, but added an extra y chromosome instead. Rar! Of course Spock got it and became more agressive. AND Spock eventually became more possessive of a certain newbie female. Ahhh...too bad they chickened out before we got some psuedo-slash. However, some Klingon was hitting on girly!Kirk and Spock made it abundantly clear to both the Klingon and Kirk that if Kirk were to try the hetero thing with the new girly body, it was going to be with HIM. Heh.
I so would have liked to see that story taken to it's porny conclusion. I'm probably not looking in the right places or people haven't really written it in my preferred pairings, but it seems even in fanfic the R to NC-17 sex change scenario is a rare one. Wintersong was writing one for Mulder and Scully, and she did eventually get to consummation (after FOR-EVAH), but I don't think she ever finished the story. Le sigh!