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複数のラジオボタンに全てチェックが入っているかでバリデーションするJquery

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js
$(function () {
   //チェックされているラジオボタンの数を数える
   var $checked_radio_count = $(".radio_button_wrapper").find('input[type="radio"]:checked').size();
   //ラジオボタンが入っているdivの数を数える
   var $radio_count = $(".radio_button_wrapper").size();

   //送信ボタンを押したときにバリデーション
   $(".submit_button").click(function(){
      if($checked_radio_count != $radio_count){
      alert("ラジオボタンが全てチェックされていません");
      return false;
      }
   }
});
html
<!--2種類のラジオボタン-->
<div class="radio_button_wrapper">
   <input id="marriage_1" name="marriage" type="radio" value="1">
   <label for="marriage_1"> 結婚していない</label><br>
   <input id="marriage_2" name="marriage" type="radio" value="2">
   <label for="marriage_2"> 結婚している</label>
</div>

<div class="radio_button_wrapper">
   <input id="gender_1" name="gender" type="radio" value="1">
   <label for="gender_1"> 男</label><br>
   <input id="gender_2" name="gender" type="radio" value="2">
   <label for="gender_2"> 女</label>
</div>

<!--送信ボタン-->
<button type="submit" class="submit_button">送信する</button>
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