diff --git a/youtube_dl/extractor/anysex.py b/youtube_dl/extractor/anysex.py
index adeacba01..95f23adf1 100644
--- a/youtube_dl/extractor/anysex.py
+++ b/youtube_dl/extractor/anysex.py
@@ -21,6 +21,7 @@ class AnySexIE(InfoExtractor):
             'description': 'md5:de9e418178e2931c10b62966474e1383',
             'categories': ['Erotic'],
             'duration': 270,
+            'age_limit': 18,
         }
     }
 
@@ -57,4 +58,5 @@ class AnySexIE(InfoExtractor):
             'categories': categories,
             'duration': duration,
             'view_count': view_count,
+            'age_limit': 18,
         }
diff --git a/youtube_dl/extractor/beeg.py b/youtube_dl/extractor/beeg.py
index c2692cfdc..6f9f4433d 100644
--- a/youtube_dl/extractor/beeg.py
+++ b/youtube_dl/extractor/beeg.py
@@ -17,6 +17,7 @@ class BeegIE(InfoExtractor):
             'description': 'md5:6db3c6177972822aaba18652ff59c773',
             'categories': list,  # NSFW
             'thumbnail': 're:https?://.*\.jpg$',
+            'age_limit': 18,
         }
     }
 
@@ -50,4 +51,5 @@ class BeegIE(InfoExtractor):
             'description': description,
             'thumbnail': thumbnail,
             'categories': categories,
+            'age_limit': 18,
         }
diff --git a/youtube_dl/extractor/eporner.py b/youtube_dl/extractor/eporner.py
index 4c2c074cb..33f9ab7a9 100644
--- a/youtube_dl/extractor/eporner.py
+++ b/youtube_dl/extractor/eporner.py
@@ -21,6 +21,7 @@ class EpornerIE(InfoExtractor):
             'title': 'Infamous Tiffany Teen Strip Tease Video',
             'duration': 194,
             'view_count': int,
+            'age_limit': 18,
         }
     }
 
@@ -52,4 +53,5 @@ class EpornerIE(InfoExtractor):
             'title': title,
             'duration': duration,
             'view_count': view_count,
+            'age_limit': 18,
         }
diff --git a/youtube_dl/extractor/hornbunny.py b/youtube_dl/extractor/hornbunny.py
index a42fba0cb..d07105d66 100644
--- a/youtube_dl/extractor/hornbunny.py
+++ b/youtube_dl/extractor/hornbunny.py
@@ -15,7 +15,8 @@ class HornBunnyIE(InfoExtractor):
             'id': '5227',
             'ext': 'flv',
             'title': 'panty slut jerk off instruction',
-            'duration': 550
+            'duration': 550,
+            'age_limit': 18,
         }
     }
 
@@ -41,4 +42,5 @@ class HornBunnyIE(InfoExtractor):
             'ext': 'flv',
             'duration': duration,
             'view_count': int_or_none(view_count),
+            'age_limit': 18,
         }
diff --git a/youtube_dl/extractor/sunporno.py b/youtube_dl/extractor/sunporno.py
index c7a46eb71..7de3c9dd5 100644
--- a/youtube_dl/extractor/sunporno.py
+++ b/youtube_dl/extractor/sunporno.py
@@ -23,6 +23,7 @@ class SunPornoIE(InfoExtractor):
             'description': 'md5:a31241990e1bd3a64e72ae99afb325fb',
             'thumbnail': 're:^https?://.*\.jpg$',
             'duration': 302,
+            'age_limit': 18,
         }
     }
 
@@ -65,4 +66,5 @@ class SunPornoIE(InfoExtractor):
             'view_count': view_count,
             'comment_count': comment_count,
             'formats': formats,
+            'age_limit': 18,
         }