Seegee:
I thought Spock was initially meant to be Uhura's love interest in the show until William Shatner's planet sized ego got in the way of that particular plot development.
The way that Mr. Spock's character quickly developed in the original "Star Trek" series, I'd find it difficult to imagine him having a long-term romantic interest (despite Nurse Chapel's obvious attraction to him), although it turned out that he did have a fiancee' via a Vulcan arranged marriage.
In the show's first episode, "Where No Man Has Gone Before," in which Majel Barrett (Gene Roddenberry's wife, who ended up portraying Ms. Chapel) played Captain Kirk's executive officer, Spock is shown to be a highly intelligent science officer, but not necessarily an emotionally repressed individual. That brief initial version of the guy, I could envision him as having a regular girlfriend, but his characterization as Captain Kirk's "logical" second-in-command changed that image for me.
Of course, William Shatner was known for wanting his character (Kirk) to be the focus of the program, including the captain being the womanizing 'stud' among the male characters.
Kirk once did rather stupidly threaten to spank an attractive but bratty alien woman, it was a foolish idea because a touch of her tears purportedly would 'enslave' any male to her will--that's a poor choice of someone to corporally chastise, I'd figure...

--C.K.