Futurama Episode 6.02 In-A-Gadda-Da-Leela

A rogue death sphere called the V-GINY, bent on censoring and destroying planets it deems to be indecent, is headed for Earth. Leela volunteers to destroy the death sphere, and reluctantly allows Zapp to come along. Their attack is disrupted and they crash land on an unknown planet similar to the Garden of Eden. Zapp shows his concerns for Leela's safety, causing Leela to gradually grow attracted to him. The two witness Earth's apparent destruction and decide to repopulate the human race à la Adam and Eve. At this point, however, Leela notices that some "fruit" Zapp had given her was actually trail mix Fry gave her, and Zapp confesses that everything was merely an elaborate scheme, including the Earth's destruction which was faked using a holographic projector from their ship, for her to think better of him and have sex with him. Furthermore, the two are actually on an island serving as the last unspoiled spot of nature on Earth. The V-GINY arrives at Earth and decides to spare it if "Adam" (Zapp) and "Eve" (Leela) have sexual intercourse, which they do.