Star Trek: Voyager - Season 3 Episode 16 -

Ensign Vorik undergoes the Vulcan mating drive known as Pon farr. The strong chemical imbalance affects B'Elanna Torres as well, leading her to irrational thoughts and behavior. Trapped in a cave, Tom Paris must try to reason with B'Elanna and get her medical attention while trying to respect his friend and deny her uncharacteristic sexual advances.