What is the issue in this form code that includes radio buttons?

<form action="/submit" method="post">
  <input type="radio" id="male" name="gender" value="male">
  <label for="male">Male</label>
  <input type="radio" id="female" name="gender" value="female">
  <label for="female">Female</label>
  <input type="submit" value="Submit">
</form>