Kif-Amy relationship

The relationship between Kif Kroker and Amy Wong is a recurring theme on Futurama.

Development
Kif and Amy's relationship first started in "A Flight to Remember" when Amy's parents introduce Kif to Amy and start their spark of relationship.

In "Amazon Women in the Mood", Kif is trying to talk to Amy but is too nervous. Zapp realizes that Amy knows Leela, whom he is constantly trying to seduce. Zapp contacts Leela and sets up half a double-date. Kif gets some bad advice from Zapp which causes Leela to proclaim the date over. After a brief trip to the bathroom to fix their makeup, they begin storming out but are stopped by Kif's emotional karaoke performance. Soon after, the men and women land on Amazonia and are to be killed by snu-snu. After finding out the truth, Amy saves Kif, he asks her what she'd like to do, and she whispers something in his ear. His response is a flustered, incomprehensible mumbling.

In "Where the Buggalo Roam", Kif tries to impress Amy and her parents, but Amy's parents don't think that Kif is a good boyfriend, though they were the one who introduced him to her. In the end, Amy and Kif "make love for the second time!"

In The Beast with a Billion Backs, their relationship got more serious when Amy announces that Kif has asked her to be his Fonfon Ru, meaning that she will be joining his clan and that their parents would also be meeting for the first time, but Kif dies. And when Yivo's tentacles came, Amy gets seduced by Zapp, and they sleep together. When Yivo makes Kif come back to life, Amy tells Kif about her affair, and they break up.

In the end of Into the Wild Green Yonder, Kif and Amy seem to get back together as they go into the wormhole. They later temporarily split up at the beginning of "Proposition Infinity", only to get back together at the end of the episode.