<script>
    var femaleForm = '<div class="col-sm-6"><div class="form-group"><input class="form-control" placeholder="Imię" required name="fname[]" type="text"></div></div><div class="col-sm-6"><div class="form-group"><input class="form-control" placeholder="Nazwisko" required name="fsurname[]" type="text"></div></div>';
    var maleForm = '<div class="col-sm-6"><div class="form-group"><input class="form-control" placeholder="Imię" required name="mname[]" type="text"></div></div><div class="col-sm-6"><div class="form-group"><input class="form-control" placeholder="Nazwisko" required name="msurname[]" type="text"></div></div>';
    $('.addAnotherPerson').on('click', function(e) {
      e.preventDefault();
      e.stopPropagation();

      if ($(this).attr('id') == 'addF') {
        $(this).prepend(femaleForm);
      } else {
        $(this).prepend(maleForm);
      }
    });
  </script>