diff --git a/frontend/app/trees/[id]/persons/[personId]/page.tsx b/frontend/app/trees/[id]/persons/[personId]/page.tsx
index 8c0bad2..211796f 100644
--- a/frontend/app/trees/[id]/persons/[personId]/page.tsx
+++ b/frontend/app/trees/[id]/persons/[personId]/page.tsx
@@ -535,6 +535,16 @@ export default function PersonDetailPage() {
     setEditingPerson(true);
   }
 
+  // Quick one-click sex setter — no need to open the full edit form. PATCH is
+  // exclude_unset on the backend, so sending only `gender` leaves the rest.
+  async function setGender(value: "male" | "female" | null) {
+    await api.PATCH("/api/v1/trees/{tree_id}/persons/{person_id}", {
+      params: { path: { tree_id: treeId, person_id: personId } },
+      body: { gender: value },
+    });
+    load();
+  }
+
   async function savePerson() {
     const { error } = await api.PATCH("/api/v1/trees/{tree_id}/persons/{person_id}", {
       params: { path: { tree_id: treeId, person_id: personId } },
@@ -711,16 +721,35 @@ export default function PersonDetailPage() {
           <h1 className="flex flex-wrap items-center gap-3 text-3xl font-semibold">
             <span className="inline-flex items-center gap-2">
               {person.primary_name ?? "Unnamed person"}
-              {person.gender === "male" && (
-                <span title="Male" aria-label="Male" style={{ color: "rgb(120, 159, 172)" }}>
-                  ♂
-                </span>
-              )}
-              {person.gender === "female" && (
-                <span title="Female" aria-label="Female" style={{ color: "rgb(196, 138, 146)" }}>
-                  ♀
-                </span>
-              )}
+            </span>
+            {/* One-click sex setter — no edit mode needed. Active = current; click it again to clear. */}
+            <span className="inline-flex items-center overflow-hidden rounded-md border border-[var(--border)] text-base font-normal">
+              <button
+                type="button"
+                onClick={() => setGender(person.gender === "male" ? null : "male")}
+                aria-pressed={person.gender === "male"}
+                title={person.gender === "male" ? "Male — click to clear" : "Set male"}
+                className={`px-3 py-1 leading-none transition-colors ${
+                  person.gender === "male"
+                    ? "bg-[rgb(120,159,172)] text-white"
+                    : "text-[var(--muted)] hover:bg-bronze/[0.07]"
+                }`}
+              >
+                ♂
+              </button>
+              <button
+                type="button"
+                onClick={() => setGender(person.gender === "female" ? null : "female")}
+                aria-pressed={person.gender === "female"}
+                title={person.gender === "female" ? "Female — click to clear" : "Set female"}
+                className={`border-l border-[var(--border)] px-3 py-1 leading-none transition-colors ${
+                  person.gender === "female"
+                    ? "bg-[rgb(196,138,146)] text-white"
+                    : "text-[var(--muted)] hover:bg-bronze/[0.07]"
+                }`}
+              >
+                ♀
+              </button>
             </span>
             {isSelf && (
               <span className="rounded-full bg-bronze/15 px-2.5 py-1 text-xs font-medium text-bronze">