Pon farr is an irresistible urge
During the movie "The Search For Spock" most folks think it is pretty obvious that Spock and Saavik had sex, and while young Spock was supposely experiencing pon farr, Saavik apparently wasn't. So unless she "caught" pon farr from Spock via mental contact, like Torres did in Voyager, that would seem to indicate that she (all Vulcan females) can and will have sex at any time.
I believe that Vulcan female do experience pon farr, in fact I hold that Spock in "Amok Time" didn't begin to enter pon farr until T'Pring also started pon farr on Vulcan. They were telepathically linked as children, T'Pring's first pon farr would be connected to her cycle, when she was old enough
and ready to concieve, she would start, the mental link would trigger Spock to start. In ancient times Spock would walk across the village or come in from the fields.
Just now had a thought. When young Spock went into pon farr on the Genesis Planet, what did old T'Pring (on Vulcan) feel?
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