PON FARR

Pon Farr happens every seven years in the life of an
adult Vulcan. The first signs are subtle: emotions are
starting to change in extreme values. Although a Vulcan could normally suppress this, he will experience an explosion of emotions. Most of the time it is anger because of all the frustrations he underwent.
When this is acknowledged as the beginning of the
Pon Farr, the Vulcan should return to his home planet and anticipate a primal ritual to get rid of the emotions.
In a conventional Pon Farr the Vulcan takes a partner,
usually arranged by the parents, so the Vulcan can return to his normal state of mind. As an alternative a fight can also help the Vulcan to return to his normal state of mind.
When Captain Kirk's first officer Spock underwent his Pon Farr on stardate 3372.7. Kirk was the on willingly
opponent. Only the fast thinking of Doctor McCoy, Chief
of Medical Staff, saved the life of the Captain. Pon Farr
is the most silent Vulcan ceremony. They would rather keep it to themselves, then to talk about it with other races.