Pon farr

In the fictional world of Star Trek, Pon Farr is the Vulcan term for the time of mating. Although Vulcans live strictly by the dictates of logic, their veneer of civilization is ripped away from them during Pon Farr, every seven years of their adult life. The individual experiencing Pon Farr will stop eating and sleeping if not allowed to return home to take a mate. During Pon Farr, the brain is thrown into a neurochemical imbalance that can be fatal if the mating drive is not acted upon. The Vulcan telepathic mating bond draws mated couples irresistibly together. Mr. Spock underwent Pon Farr in 2267, when he returned to Vulcan, only to be spurned by his betrothed, T'Pring. Spock again experienced Pon Farr when his regenerated body was undergoing hyperaccelerated growth on the Genesis Planet in 2285. Spock was lucky that Saavik, a Vulcan female, was also present