While I was researching about voice interface and how to design one properly, I stumbled into this article.

While the story about why users preferred female voices was certainly interesting, I was quite intriguied by what Rebecca Zorach, the Director of the Social Media Project at the University of Chicago's Center for the Study of Gender and Sexuality, said in the article.

"What's interesting to me is how they seem to intentionally make her [Siri’s] speech sound artificial -- they could choose to make her speech more seamless and human-like, but they choose instead to highlight the technology," she said. "That makes you aware of how high-tech your gadget is."

via CNN