2) There have been frequent studies which show that there is a natural (i.e. not cultural) bias towards finding female voices more pleasant, and such preferences begin in the womb[1]. CNN[2] has a story which provides a good overview of this topic, and I am sure you could find other information about if you feel so inclined.

Basically, I do not think the decision to make Siri female was based upon simple prejudice. There are good, scientific reasons for doing so.

[1] http://www.sciencemag.org/content/208/4448/1174.short

[2] http://www.cnn.com/2011/10/21/tech/innovation/female-compute...

Thanks for bringing this up.