diff --git a/util/disallowed-cnames.json b/util/disallowed-cnames.json
index 7de9403b71..70ee86789e 100644
--- a/util/disallowed-cnames.json
+++ b/util/disallowed-cnames.json
@@ -1,12 +1,17 @@
 [
+    ".adult",
     ".blob.core.windows.net",
     ".cf",
     ".cfargotunnel.com",
     ".ga",
     ".gq",
     ".ml",
+    ".porn",
     ".r2.dev",
+    ".sex",
+    ".sexy",
     ".trycloudflare.com",
     ".tk",
-    ".workers.dev"
+    ".workers.dev",
+    ".xxx"
 ]