Here’s how to switch between female and male voices with Google Home
First you need to note this only seems to work if you have set the Assistant's language to US English. I did not see any menu options on my phone to do this , but what did work was giving this command to the Google Home speaker: “Ok Google” and say “change your voice”. If your device is still set to UK English or a non-US English, Google Home will comment that she can't do that yet. If you are on US English "he" will reply and ask if you want to change.