TL;DR - Why Siri is Totally Sexist [2/Jul/16]

Source:
https://newrepublic.com/article/134560/stop-giving-digital-assistants-female-voices

Men and women both prefer women to men:
http://www.apa.org/monitor/dec04/women.aspx
http://www.ncbi.nlm.nih.gov/pubmed/15491274

Male voices are typically associated with being pschopathic killing machines:
http://edition.cnn.com/2011/10/21/tech/innovation/female-computer-voices/index.html

People don't use voice assitants very much
http://creativestrategies.com/voice-assistant-anyone-yes-please-but-not-in-public/
http://info.mindmeld.com/rs/564-PPG-541/images/Intelligent%20Voice%20Assistants%20Research%20Report-Q1%202016.pdf