How to correctly fill WP_Query{} wordpress arguments?

Question

WordPress

Through acf created fields "sex", "profession". Then through a simple form I want to filter the records

<form method="POST">
      <div> </div>
      <input name="wsex[]" value="Male" type="checkbox">      Мужчина <br>
      <input name="wsex[]" value="Female"        type="checkbox"> Женщина <br>
      <div>        <hr>
 <input name="wprofession[]" value="cook"      type="checkbox"> повар <br>
        <input name="wprofession[]" value="watchman"      type="checkbox"> сторож <br>
      </div>
    </form>

I want to display suitable posts through WP_Query {}. I'm trying to output like this

$args = [
  'meta_query' => [
    'relation' => 'OR',  // AND
    [
      'key' => 'sex',
      'value' => $_POST['wsex']
    ],
    [
      'key' => 'profession',
      'value' => $_POST['wprofession']
    ]
  ]
];

And then a parade of errors begins - either types are not defined, then nothing is displayed, then all posts are immediately displayed. How to properly populate key and value in multiple select?