In a scene that was thankfully deleted from Revenge Of The Sith, Senator Palpatine reveals to Anakin that he "used the power of the Force to will the midi-chlorians to start the cell divisions that created [Anakin]." In other words, he used magic sperm to knock up Ani's mom. But that backstory was recently made official by the comic series Darth Vader: Dark Lord Of The Sith. In the big finale, Vader goes on a psychedelic Force trip and witnesses Palpatine's creepy psychic insemination. The dude shows up like the Ghost of Christmas Future and puts a Force bun in Shmi's oven.
It's hard to say whether or not the Star Wars canon (or really, the world in general) is better with this image in it.