It may not make sense but it was so cool and exotic.
And basically a great effort to make some of the aliens in Star Trek act differently from humans.
I have another pon farr type question though. Sorry to change the topic slightly. The 'Intrepid' had I assume 400+ Vulcans aboard. Assuming everyone on board goes into pon farr every 7 years then they'd be turning back to Vulcan 400/7 ~ 57 or times per year or about once a week. Is my maths OK? Or was there something in DS9 or VOY about Vulcans always serving in Starfleet as couples. Except for Spock or Tuvok or that other Vulcan guy in VOY.