Somehow OvaryPowerThreshold can end up as 0 and cause errors, so be sure to make it minimum 1

1.4/source/RJW_Menstruation/RJW_Menstruation/Configurations.cs

@@ -53,7 +53,6 @@ namespace RJW_Menstruation
         public static float EstrusFuckabilityToHookup = RJWHookupSettings.MinimumFuckabilityToHookup;
         public static float EstrusAttractivenessToHookup = RJWHookupSettings.MinimumAttractivenessToHookup;
         public static float EstrusRelationshipToHookup = RJWHookupSettings.MinimumRelationshipToHookup;
-        //        public static bool UseMultiplePregnancy = true;
         public static PregnancyType PregnancySource = PregnancyType.MultiplePregnancy;
         public static bool EnableHeteroOvularTwins = true;
         public static bool EnableEnzygoticTwins = true;
@@ -90,7 +89,6 @@ namespace RJW_Menstruation
             EnzygoticTwinsChanceAdjust = EnzygoticTwinsChanceAdjustDefault;
             EnableEnzygoticTwins = true;
             EnableHeteroOvularTwins = true;
-            //            UseMultiplePregnancy = true;
             PregnancySource = PregnancyType.MultiplePregnancy;
             MaxEnzygoticTwins = MaxEnzygoticTwinsDefault;
             BleedingAmount = BleedingAmountDefault;
@@ -198,7 +196,6 @@ namespace RJW_Menstruation
             Scribe_Values.Look(ref EstrusFuckabilityToHookup, "EstrusFuckabilityToHookup", EstrusFuckabilityToHookup, true);
             Scribe_Values.Look(ref EstrusAttractivenessToHookup, "EstrusAttractivenessToHookup", EstrusAttractivenessToHookup, true);
             Scribe_Values.Look(ref EstrusRelationshipToHookup, "EstrusRelationshipToHookup", EstrusRelationshipToHookup, true);
-            //Scribe_Values.Look(ref UseMultiplePregnancy, "UseMultiplePregnancy", UseMultiplePregnancy, true);
             Scribe_Values.Look(ref PregnancySource, "PregnancySource", PregnancySource, true);
             Scribe_Values.Look(ref EnableHeteroOvularTwins, "EnableHeteroOvularTwins", EnableHeteroOvularTwins, true);
             Scribe_Values.Look(ref EnableEnzygoticTwins, "EnableEnzygoticTwins", EnableEnzygoticTwins, true);
@@ -428,7 +425,6 @@ namespace RJW_Menstruation
                 Configurations.EstrusRelationshipToHookup = listmain.Slider((int)Configurations.EstrusRelationshipToHookup, -100f, 100f);
             }
 
-            //            listmain.CheckboxLabeled(Translations.Option13_Label, ref Configurations.UseMultiplePregnancy, Translations.Option13_Desc);
             if (listmain.RadioButton(Translations.Option_PregnancyFromBaseRJW_Label, Configurations.PregnancySource == Configurations.PregnancyType.BaseRJW))
                 Configurations.PregnancySource = Configurations.PregnancyType.BaseRJW;
             if (listmain.RadioButton(Translations.Option_PregnancyFromMultiplePregnancy_Label, Configurations.PregnancySource == Configurations.PregnancyType.MultiplePregnancy))

1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs

@@ -166,7 +166,7 @@ namespace RJW_Menstruation
         {
             get
             {
-                if (opcache >= 0) return opcache;
+                if (opcache > 0) return opcache;
                 float avglittersize;
                 try
                 {
@@ -182,6 +182,7 @@ namespace RJW_Menstruation
                     avglittersize *
                     yearsBeforeMenopause *
                     (Pawn.def.race.lifeExpectancy / ThingDefOf.Human.race.lifeExpectancy));
+                if (opcache == 0) opcache = 1;
                 return opcache;
             }
         }