diff --git a/.github/in-solidarity.yml b/.github/in-solidarity.yml
index d2d76e1..dac85d8 100644
--- a/.github/in-solidarity.yml
+++ b/.github/in-solidarity.yml
@@ -310,6 +310,14 @@ rules:
       - oblivious to
       - indifferent to
 
+  bio-sex:
+    regex:
+      - /\(?\bbiological\w*\b\)?\s+sex\w*/gi
+      - /sex\w*\s+\(?\bbiological\w*\b\)?/gi
+    level: warning
+    alternatives:
+      - sex
+
   # This occurs in the IETF boilerplate text...
   # right:
   #   regex: