Unit 47

Unit 47 is a robot who worked with Professor Farnsworth as a chemist trying to solve a deadly posy virus in his youth, and who became his robosexual lover. She eventually left him for another robot after 43 years together. These events left the professor loathing the idea of robosexuality, leading to his objection against Proposition ∞ in year 3010.

Farnsworth claimed for many years that she had been a human female, named Eunis, and who left him for a robot, which turned him against robosexuality, but he finally admits that she was in fact a robot.