diff --git a/app/Models/Pages/Admin/Install.php b/app/Models/Pages/Admin/Install.php
index 46ae9c61..9543a5c3 100644
--- a/app/Models/Pages/Admin/Install.php
+++ b/app/Models/Pages/Admin/Install.php
@@ -1130,7 +1130,7 @@ class Install extends Admin
                 'u_pm_last_post'   => ['INT(10) UNSIGNED', false, 0],
                 'warning_flag'     => ['TINYINT(1)', false, 0],
                 'warning_all'      => ['INT(10) UNSIGNED', false, 0],
-                'gender'           => ['TINYINT UNSIGNED', false, 0],
+                'gender'           => ['TINYINT UNSIGNED', false, FORK_GEN_NOT],
                 'u_mark_all_read'  => ['INT(10) UNSIGNED', false, 0],
                 'last_report_id'   => ['INT(10) UNSIGNED', false, 0],
                 'ip_check_type'    => ['TINYINT UNSIGNED', false, 0],
diff --git a/app/Models/Pages/Admin/Users/View.php b/app/Models/Pages/Admin/Users/View.php
index e8d8def2..d0cd8e6e 100644
--- a/app/Models/Pages/Admin/Users/View.php
+++ b/app/Models/Pages/Admin/Users/View.php
@@ -66,7 +66,7 @@ class View extends Users
                         'email'           => 'string:null|max:80',
                         'title'           => 'string:null|max:50',
                         'realname'        => 'string:null|max:40',
-                        'gender'          => 'integer|in:0,1,2',
+                        'gender'          => 'integer|in:' . FORK_GEN_NOT . ',' . FORK_GEN_MAN . ',' . FORK_GEN_FEM,
                         'url'             => 'string:null|max:100',
                         'location'        => 'string:null|max:30',
                         'signature'       => 'string:null|max:512',
@@ -208,9 +208,9 @@ class View extends Users
             'value'     => $data['realname'] ?? null,
         ];
         $genders = [
-            0 => __('Do not display'),
-            1 => __('Male'),
-            2 => __('Female'),
+            FORK_GEN_NOT => __('Do not display'),
+            FORK_GEN_MAN => __('Male'),
+            FORK_GEN_FEM => __('Female'),
         ];
         $fields['gender'] = [
 #            'class'   => ['block'],
diff --git a/app/Models/Pages/Profile/Edit.php b/app/Models/Pages/Profile/Edit.php
index 2b3bc16e..543f1ab3 100644
--- a/app/Models/Pages/Profile/Edit.php
+++ b/app/Models/Pages/Profile/Edit.php
@@ -92,7 +92,7 @@ class Edit extends Profile
                     'delete_avatar' => $ruleDelAvatar,
                     'admin_note'    => $ruleAdminNote,
                     'realname'      => 'exist|string:trim|max:40|noURL:1',
-                    'gender'        => 'required|integer|in:0,1,2',
+                    'gender'        => 'required|integer|in:' . FORK_GEN_NOT . ',' . FORK_GEN_MAN . ',' . FORK_GEN_FEM,
                     'location'      => 'exist|string:trim|max:30|noURL:1',
                     'email_setting' => 'required|integer|in:0,1,2',
                     'url'           => $ruleWebsite,
@@ -374,9 +374,9 @@ class Edit extends Profile
             'value'     => $this->curUser->realname,
         ];
         $genders = [
-            0 => __('Do not display'),
-            1 => __('Male'),
-            2 => __('Female'),
+            FORK_GEN_NOT => __('Do not display'),
+            FORK_GEN_MAN => __('Male'),
+            FORK_GEN_FEM => __('Female'),
         ];
         $fields['gender'] = [
             'class'   => ['block'],
diff --git a/app/Models/Pages/Profile/View.php b/app/Models/Pages/Profile/View.php
index 3ab952df..a8a5897c 100644
--- a/app/Models/Pages/Profile/View.php
+++ b/app/Models/Pages/Profile/View.php
@@ -118,8 +118,8 @@ class View extends Profile
             ];
         }
         $genders = [
-            1 => __('Male'),
-            2 => __('Female'),
+            FORK_GEN_MAN => __('Male'),
+            FORK_GEN_FEM => __('Female'),
         ];
         if (isset($genders[$this->curUser->gender])) {
             $fields['gender'] = [
diff --git a/app/Models/Provider/Driver/GitHub.php b/app/Models/Provider/Driver/GitHub.php
index 0349c9a4..396e9e56 100644
--- a/app/Models/Provider/Driver/GitHub.php
+++ b/app/Models/Provider/Driver/GitHub.php
@@ -145,6 +145,6 @@ class GitHub extends Driver
      */
     protected function getuserGender(): int
     {
-        return 0;
+        return FORK_GEN_NOT;
     }
 }
diff --git a/app/templates/pm/post.forkbb.php b/app/templates/pm/post.forkbb.php
index d9a6d73e..0d0ad386 100644
--- a/app/templates/pm/post.forkbb.php
+++ b/app/templates/pm/post.forkbb.php
@@ -22,7 +22,7 @@
       <h2>{!! __($p->postsTitle) !!}</h2>
     @foreach ($p->posts as $post)
         @if ($post->id)
-      <article id="p{{ $post->id }}" class="f-post @if (1 == $post->user->gender) f-user-male @elseif (2 == $post->user->gender) f-user-female @endif">
+      <article id="p{{ $post->id }}" class="f-post @if (FORK_GEN_MAN == $post->user->gender) f-user-male @elseif (FORK_GEN_FEM == $post->user->gender) f-user-female @endif">
         <header class="f-post-header">
           <h3 class="f-phead-h3">@if ($post->postNumber > 1){!! __('Re') !!} @endif{{ $post->parent->name }}</h3>
           <span class="f-post-posted"><time datetime="{{ \gmdate('c', $post->posted) }}">{{ dt($post->posted) }}</time></span>
diff --git a/app/templates/pm/topic.forkbb.php b/app/templates/pm/topic.forkbb.php
index 2bd17e81..4bf9a162 100644
--- a/app/templates/pm/topic.forkbb.php
+++ b/app/templates/pm/topic.forkbb.php
@@ -44,7 +44,7 @@
     @if (empty($post->id) && $iswev = [FORK_MESS_ERR => [['Message %s was not found in the database', $id]]])
         @include ('layouts/iswev')
     @else
-      <article id="p{{ $post->id }}" class="f-post @if (1 == $post->user->gender) f-user-male @elseif (2 == $post->user->gender) f-user-female @endif @if ($post->user->online) f-user-online @endif @if (1 === $post->postNumber) f-post-first @endif">
+      <article id="p{{ $post->id }}" class="f-post @if (FORK_GEN_MAN == $post->user->gender) f-user-male @elseif (FORK_GEN_FEM == $post->user->gender) f-user-female @endif @if ($post->user->online) f-user-online @endif @if (1 === $post->postNumber) f-post-first @endif">
         @if ($p->enableMod && $post->postNumber > 1)
         <input id="checkbox-{{ $post->id }}" class="f-post-checkbox" type="checkbox" name="ids[{{ $post->id }}]" value="{{ $post->id }}" form="id-form-mod">
         @endif
diff --git a/app/templates/post.forkbb.php b/app/templates/post.forkbb.php
index 297b8bce..b78d370f 100644
--- a/app/templates/post.forkbb.php
+++ b/app/templates/post.forkbb.php
@@ -32,7 +32,7 @@
       <h2>{!! __($p->postsTitle) !!}</h2>
     @foreach ($p->posts as $post)
         @if ($post->id)
-      <article id="p{{ $post->id }}" class="f-post @if (1 == $post->user->gender) f-user-male @elseif (2 == $post->user->gender) f-user-female @endif">
+      <article id="p{{ $post->id }}" class="f-post @if (FORK_GEN_MAN == $post->user->gender) f-user-male @elseif (FORK_GEN_FEM == $post->user->gender) f-user-female @endif">
         <header class="f-post-header">
           <h3 class="f-phead-h3">@if ($post->postNumber > 1){!! __('Re') !!} @endif{{ $post->parent->name }}</h3>
           <span class="f-post-posted"><time datetime="{{ \gmdate('c', $post->posted) }}">{{ dt($post->posted) }}</time></span>
diff --git a/app/templates/topic.forkbb.php b/app/templates/topic.forkbb.php
index a2dcda05..c41ef4ca 100644
--- a/app/templates/topic.forkbb.php
+++ b/app/templates/topic.forkbb.php
@@ -51,7 +51,7 @@
     @if (empty($post->id) && $iswev = [FORK_MESS_ERR => [['Message %s was not found in the database', $id]]])
         @include ('layouts/iswev')
     @else
-      <article id="p{{ $post->id }}" class="f-post @if (1 == $post->user->gender) f-user-male @elseif (2 == $post->user->gender) f-user-female @endif @if ($post->user->online) f-user-online @endif @if (1 === $post->postNumber) f-post-first @endif">
+      <article id="p{{ $post->id }}" class="f-post @if (FORK_GEN_MAN == $post->user->gender) f-user-male @elseif (FORK_GEN_FEM == $post->user->gender) f-user-female @endif @if ($post->user->online) f-user-online @endif @if (1 === $post->postNumber) f-post-first @endif">
         @if ($p->enableMod && $post->postNumber > 1)
         <input hidden id="checkbox-{{ $post->id }}" class="f-post-checkbox" type="checkbox" name="ids[{{ $post->id }}]" value="{{ $post->id }}" form="id-form-mod">
         @endif
diff --git a/app/templates/topic_in_search.forkbb.php b/app/templates/topic_in_search.forkbb.php
index d557ec3a..ba4adcef 100644
--- a/app/templates/topic_in_search.forkbb.php
+++ b/app/templates/topic_in_search.forkbb.php
@@ -38,7 +38,7 @@
     @if (empty($post->id) && $iswev = [FORK_MESS_ERR => [['Message %s was not found in the database', $id]]])
         @include ('layouts/iswev')
     @else
-      <article id="p{{ $post->id }}" class="f-post f-post-search @if (1 == $post->user->gender) f-user-male @elseif (2 == $post->user->gender) f-user-female @endif @if ($post->user->online) f-user-online @endif">
+      <article id="p{{ $post->id }}" class="f-post f-post-search @if (FORK_GEN_MAN == $post->user->gender) f-user-male @elseif (FORK_GEN_FEM == $post->user->gender) f-user-female @endif @if ($post->user->online) f-user-online @endif">
         <header class="f-post-header">
           <h3 class="f-phead-h3">
             <span class="f-psh-forum"><a href="{{ $post->parent->parent->link }}" title="{{ __('Go to forum') }}">{{ $post->parent->parent->forum_name }}</a></span>