Pon Farr is a fictional biological condition featured in the Star Trek multimedia franchise. It relates to the Vulcan culture, and is basically their version of a mating ritual. Male Vulcans undergo Pon Farr once every seven years, at which point, they become quite irritable, to say nothing of horny. Nobody wants to be around a horny Vulcan when the Pon Farr sets in. The sexual drive of a Vulcan during Pon Farr is so strong that it even affects diluted bloodlines, such as half-Vulcans. The crew of the USS Enterprise played witness to this spectacle when they had to bring Mister Spock back to the planet Vulcan to undergo Pon Farr.