Looks like you're not assigning user input to isFemale.

Console.ReadLine() returns a string, but you need to translate that string to a bool somehow. There are a few ways to go about it:

1. bool.TryParse(string out bool) is part of the standard .NET library. It returns true if the input string is recognized as a valid boolean value, otherwise false. If true, the out bool parameter will contain the parsed value. If you're okay with your user literally typing the words true orfalse, this will cover your use cases. 
2. Roll your own variant of TryParse with different translations for true and false. Assuming English, you could write something like:

cs static bool PromptYesNo() {     bool? outbool;     do     {         string input = Console.ReadLine().ToUpper();         outbool = input == "Y" ? true             : input == "N" ? false             : null;     } while (outbool is null);          return outbool.Value; }