Pon Farr

Pon farr is a neuro-physiological condition in Vulcans from the Star Trek continuum. Every seven years, adult Vulcans experience an overwhelming and irresistable urge to take a mate - failure to do so could result in death. It is considered an intensely private condition that they rarely speak of with anyone outside of Vulcan society.

If a Vulcan suffering from it mind melds with someone, that someone develops it too, regardless of species.

More about the Pon farr at Memory-Alpha.