diff --git a/youtube_dl/extractor/redtube.py b/youtube_dl/extractor/redtube.py
index 365aade56..994778e16 100644
--- a/youtube_dl/extractor/redtube.py
+++ b/youtube_dl/extractor/redtube.py
@@ -10,7 +10,8 @@ class RedTubeIE(InfoExtractor):
         u'file': u'66418.mp4',
         u'md5': u'7b8c22b5e7098a3e1c09709df1126d2d',
         u'info_dict': {
-            u"title": u"Sucked on a toilet"
+            u"title": u"Sucked on a toilet",
+            u"age_limit": 18,
         }
     }
 
diff --git a/youtube_dl/extractor/xvideos.py b/youtube_dl/extractor/xvideos.py
index c3b9736d7..90138d7e5 100644
--- a/youtube_dl/extractor/xvideos.py
+++ b/youtube_dl/extractor/xvideos.py
@@ -13,7 +13,8 @@ class XVideosIE(InfoExtractor):
         u'file': u'939581.flv',
         u'md5': u'1d0c835822f0a71a7bf011855db929d0',
         u'info_dict': {
-            u"title": u"Funny Porns By >>>>S<<<<<< -1"
+            u"title": u"Funny Porns By >>>>S<<<<<< -1",
+            u"age_limit": 18,
         }
     }
 
@@ -46,6 +47,7 @@ def _real_extract(self, url):
             'ext': 'flv',
             'thumbnail': video_thumbnail,
             'description': None,
+            'age_limit': 18,
         }
 
         return [info]
diff --git a/youtube_dl/extractor/youporn.py b/youtube_dl/extractor/youporn.py
index b1f93dd1b..e3b56cece 100644
--- a/youtube_dl/extractor/youporn.py
+++ b/youtube_dl/extractor/youporn.py
@@ -26,7 +26,8 @@ class YouPornIE(InfoExtractor):
             u"upload_date": u"20101221", 
             u"description": u"Love & Sex Answers: http://bit.ly/DanAndJenn -- Is It Unhealthy To Masturbate Daily?", 
             u"uploader": u"Ask Dan And Jennifer", 
-            u"title": u"Sex Ed: Is It Safe To Masturbate Daily?"
+            u"title": u"Sex Ed: Is It Safe To Masturbate Daily?",
+            u"age_limit": 18,
         }
     }