To make it happen, press down the home button on your phone to launch Google Assistant, then press that blue icon on the top right side of the page. From there, go to the Settings menu, then preferences, then Assistant Voice.
On Google Home you'll need to go into the app, select More settings from the hamburger menu, and then Preferences followed by Assistant Voice.
The male voice is labelled as "Voice 2" while the female option is "Voice 1".
That's it. It's super easy to change (and super easy to change back) if you want to try something new.
