Why is Apple’s Siri a female? The Toronto Star asked Clifford Nass, a Stanford University professor and expert on human and artificial intelligence interaction, and he says that Siri is a female because many years of research has shown that people often associate females with stereotypical assistant and clerical duties.
“First, it is stereotyping,” Nass says, “Second, it is much easier to find a female voice acceptable to everyone. And third, in certain contexts, female voices are easier to hear.”
The article goes into the whole human vs. machine connection slightly more in depth. Hopefully, Siri will be able to have a modified voice, so you can dictate instructions to Darth Vader, or other pop culture figures.