So according to Memory Alpha both male and female Vulcans mate once every 7 years. How they have survived as a species is beyond me. The likelihood of two Vulcans being on the same cycle seems minuscule.
On earth females often have a mating cycle, are there any earth species were the males go through a mating cycle?
IIRC, Vulcans are one of the most passionate humanoid races when they do not engage in their superhuman self control and emotional suppression. If they go 7 years without mating the super urges they suppress come to the surface and they can’t control them. Spock had apparently not mated in 7 years and was in “gotta have it” mode.
What I’m not sure of is why he had to go back to Vulcan to get him some. I’m sure there were some other she-Vulcans out there, and if not his father certainly was able to make do with a human and he was full Vulcan, unlike Spock who was already half human.
I just don’t think they ever fully developed it.
Even she was only willing to walk away from it using the Vulcan cultural system that allowed for that. She wanted a proper divorce, and engineered a situation where it would happen.
Still, it does make the whole idea that “Spock will die if we don’t take him back to Vulcan” seem wrong. Kirk deliberately disobeys orders to pull it off. The only thing that makes it work for me is that Spock was so emotionally agitated that the other option didn’t occur to him.
I’m not saying he wouldn’t have preferred to go back to Vulcan, just that he wouldn’t have portrayed it as life or death.