Gender is a ready-made question with the answers Female and Male. It needs no answer options, so it takes a few seconds to add. When the question is not mandatory, participants can also pick No answer.
Click the purple + in the top bar. The question type picker opens.
Under Ranking & rating, click Gender. The question appears at the end of the current question group.
Click Your question here and type your question, for example "What is your gender?".
Select the question to open its settings on the right.
The answer is F for Female and M for Male, and empty for No answer.
Not to this type: its answers are fixed. Use List (radio) or Single choice buttons and type the answers you need.
Yes. Turn on Store answers encrypted under Advanced > General before you activate the survey. See Encrypt personal data in your survey.