Captain Robert April wrote:
The race would probably go extinct if the females only became fertile only once every seven years, so it's much more likely that the pon farr mating drive is the only time they have to mate. Otherwise, they can (and almost certain do) mate any time they damn well want to.
That seems to be the most widely-favoured interpretation. Certainly, IMO, it makes the most sense.
Noting, however, that Vulcans do have a 200+ year lifespan, and allegedly don't hit sexual maturity until they hit 50 or so. That is going by what was said in 'Enterprise' a couple of times, though nuSpock in the movie might have been an early bloomer in that regard - his Human genes, perhaps?