The Enterprise Incident originally had a much sexier scene with Spock and the Romulan commander

Vulcan lore has always had any romantic overtures happening with their hands as established in "Journey to Babel" when Sarek held Amanda's fingers. Robert Justman, one of the co-producers for the third season of Star Trek: The Original Series nearly changed all that with the suggestion that a more romantic scene be inserted in ' "The Enterprise Incident."

Not only did Justman want there to be a brief romance between Spock and the female Romulan Commander, but he wanted it to be heated up. Producer Fred Freiberger agreed, and by the time the script, which was written by D.C. Fontana, made its way back to her, that particular scene had undergone a steamier change, according to These Are The Voyages Books.

In it, Spock was "raining kisses on every square inch above her [the Romulan Commander] shoulder." As he tells her she's beautiful, she drapes herself across the divan with an "inviting pose." She then asks Spock if he likes it, and he pulls her into an embrace, telling her he adores her. Needless to say Fontana had issues with the updates to the scene and responded with a letter reminding everyone of how Vulcans had been established.

"Gentlemen...these are not the outcries of a wounded writer, but of an ex-story editor with four years of service stripes for Star Trek...We have established Vulcans do not nuzzle, kiss, hug, or display any other form of human affection. The Vulcan outward sign of affection is expressed in a certain touching of hands as demonstrated in "Journey to Babel." If Spock behaves in such outlandishly embarrassing human manner as indicated in this scene, he violates the character we have established for him, and the culture he comes from."

- D.C. Fontana

Fontana reminded the producers that Spock's ardent advances would make the Commander suspicious and then added that the Star Trek fans knew what was and wasn't Vulcan, and they would be outspoken about something that wasn't.

Leonard Nimoy had an issue with the script change as well and wrote a letter to Gene Roddenberry objecting to "Spock's oversexed behavior." And though both his and Fontana's objects resulted in the scene being tamed, Fontana still wasn't happy with how it was rewritten, proclaiming later that the sexual tension wasn't something she would believe. Her objections make sense as the Romulan Commander should have been more suspicious of Spock. Her falling so quickly for him just didn't look like something a Romulan Commander or even Spock himself would do.