RJW tends not to set usedCondom on both participants in sex, so check for both

1.5/source/RJW_Menstruation/RJW_Menstruation/HediffComps/MenstruationUtility.cs

@@ -244,7 +244,8 @@ namespace RJW_Menstruation
                 isInduced &&
                 comp.Pawn.jobs.curDriver is JobDriver_Sex job &&
                 job.Sexprops != null &&
-                !job.Sexprops.usedCondom &&
+                //!job.Sexprops.usedCondom &&
+                !UsingCondom(comp.Pawn, job.Partner) &&
                 (job.Sexprops.sexType == xxx.rjwSextype.Vaginal || job.Sexprops.sexType == xxx.rjwSextype.DoublePenetration))
                 ovulatoryProgress = 0.0f;
             else if (comp.curStage == HediffComp_Menstruation.Stage.Ovulatory) ovulatoryProgress = isInduced ? Mathf.Max(ovaryChanceToShow_01, comp.StageProgessNextUpdate) : comp.StageProgessNextUpdate;
@@ -466,5 +467,14 @@ namespace RJW_Menstruation
 
             return damage.totalDamageDealt;
         }
+
+        // RJW only sets usedCondom on the sexprops of the initiator, so work around that by checking for either pawn having it set
+        public static bool UsingCondom(Pawn pawn, Pawn partner)
+        {
+            return
+                ((pawn?.jobs?.curDriver as JobDriver_Sex)?.Sexprops.usedCondom ?? false)
+                ||
+                ((partner?.jobs?.curDriver as JobDriver_Sex)?.Sexprops.usedCondom ?? false);
+        }
     }
 }

1.5/source/RJW_Menstruation/RJW_Menstruation/Patch/RJW_Patch.cs

@@ -19,13 +19,11 @@ namespace RJW_Menstruation
         public static bool Prefix(SexProps props)
         {
             xxx.rjwSextype sextype = props.sexType;
-            Pawn pawn = props.pawn;
+            Pawn pawn = props.pawn;         // Penis
-            Pawn partner = props.partner;
+            Pawn partner = props.partner;   // Womb
 
             if (sextype != xxx.rjwSextype.Vaginal && sextype != xxx.rjwSextype.DoublePenetration) return true;
-
             if (!partner.ShouldCycle()) return true;
-
             if (!InteractionCanCausePregnancy(props)) return false;
 
             List<Hediff> pawnparts = Genital_Helper.get_PartsHediffList(pawn, Genital_Helper.get_genitalsBPR(pawn));
@@ -38,6 +36,8 @@ namespace RJW_Menstruation
 
             if (Genital_Helper.has_penis_fertile(pawn, pawnparts) && PregnancyHelper.CanImpregnate(pawn, partner, sextype))
             {
+                if (MenstruationUtility.UsingCondom(pawn, partner)) return false;   // Shouldn't be needed, but RJW has a bug in the condom checks
+
                 PregnancyHelper.DoImpregnate(pawn, partner);
                 return false;
             }
@@ -344,7 +344,8 @@ namespace RJW_Menstruation
             xxx.rjwSextype sextype = __instance.Sexprops.sexType;
             if (!(target is Pawn partner)) return;
             if (sextype != xxx.rjwSextype.Vaginal && sextype != xxx.rjwSextype.DoublePenetration) return;
-            if (__instance.Sexprops.usedCondom) return;
+            //if (__instance.Sexprops.usedCondom) return;
+            if (MenstruationUtility.UsingCondom(pawn, partner)) return;
             if (AndroidsCompatibility.IsAndroid(pawn)) return;
             if (!Impregnate_Patch.InteractionCanCausePregnancy(__instance.Sexprops)) return;
             if (!partner.ShouldCycle()) return;

changelogs.txt

@@ -1,5 +1,6 @@
 Version 1.5.0.0
  - Support for RimWorld 1.5. All future changes to Menstruation will only be for Rimworld 1.5.
+ - More reliably detect the usage of condoms.
 
 Version 1.0.9.4
  - Added graphics for the menstruation genes with thanks to Alpenglow.