When designing Siri, the people involved crafted a backstory for Siri, answering questions like "Is Siri a male or a female?", "Is Siri human, computer, or something else?", "Is Siri an Apple employee (or what's the relationship to Apple)", etc. You'll be happy to know that Siri was designed to be neither male nor female, no matter what voice it speaks with -- ask it and you will see...