diff --git a/1.4/Assemblies/RJW_Menstruation.dll b/1.4/Assemblies/RJW_Menstruation.dll
index 14f7597..ce5f760 100644
Binary files a/1.4/Assemblies/RJW_Menstruation.dll and b/1.4/Assemblies/RJW_Menstruation.dll differ
diff --git a/1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs b/1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs
index cea0d19..2745e80 100644
--- a/1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs
+++ b/1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs
@@ -123,6 +123,8 @@ namespace RJW_Menstruation
         protected string customwombtex = null;
         protected string customvagtex = null;
         protected bool estrusflag = false;
+        protected float ovulationChanceCache = -1.0f;   // Dirtied every simulation
+        protected float implantationChanceCache = -1.0f;
         protected int opcache = -1;
         protected float antisperm = 0.0f;
         protected float? originvagsize = null;
@@ -294,58 +296,71 @@ namespace RJW_Menstruation
         // I hate doing this, but it's the least bad option
         public bool calculatingOvulationChance = false;
 
+        protected float CalcuatedOvulationChance()
+        {
+            float ovulationChance = 1.0f;
+            if (EggHealth <= 0.0f) return 0.0f;
+            if (EggHealth < 1.0f / 3.0f) ovulationChance = 0.8f;
+            if (ModsConfig.BiotechActive && xxx.is_human(Pawn))
+            {
+                if (Pawn.SterileGenes()) return 0.0f;
+                // Replicate how rjw.PawnCapacityWorker_Fertility.CalculateCapacityLevel does it, but without the age factor
+                if (!Pawn.RaceHasFertility()) return 0.0f;
+                if (AndroidsCompatibility.IsAndroid(Pawn) && parent.def != Genital_Helper.archotech_vagina) return 0.0f;
+                foreach (var part in StatDefOf.Fertility.parts)
+                {
+                    if(part is StatPart_FertilityByGenderAge fertilityByAge)
+                    {
+                        float factor = 1.0f;
+                        fertilityByAge.TransformValue(StatRequest.For(Pawn), ref factor);
+                        if (factor <= 0.0f) return 0.0f;    // Too young or too old
+                    }
+                    else part.TransformValue(StatRequest.For(Pawn), ref ovulationChance);
+                }
+                if (Pawn.HasQuirk(QuirkUtility.Quirks.Breeder)) ovulationChance *= 10.0f;
+                try
+                {
+                    calculatingOvulationChance = true;
+                    ovulationChance *= PawnCapacityUtility.CalculateCapacityLevel(Pawn.health.hediffSet, xxx.reproduction);
+                }
+                finally { calculatingOvulationChance = false; }
+            }
+            return ovulationChance;
+        }
+
+        protected float CalcuatedImplantChance()
+        {
+            float factor = 1.0f;
+            if (ModsConfig.BiotechActive && xxx.is_human(Pawn))
+            {
+                // Implant factor will be based solely on pawn age, plus any rollover from ovulation chance
+                StatPart_FertilityByGenderAge fertilityStatPart = StatDefOf.Fertility.GetStatPart<StatPart_FertilityByGenderAge>();
+                fertilityStatPart?.TransformValue(StatRequest.For(Pawn), ref factor);
+                float ovulationOverflow = OvulationChance;
+                if (ovulationOverflow > 1.0f) factor *= ovulationOverflow;
+                return Props.baseImplantationChanceFactor * FertilityModifier * factor;
+            }
+            else
+            {
+                return Pawn.health.capacities.GetLevel(xxx.reproduction) * Props.baseImplantationChanceFactor * FertilityModifier * factor;
+            }
+        }
+
         public float OvulationChance
         {
             get
             {
-                float ovulationChance = 1.0f;
-                if (EggHealth <= 0.0f) return 0.0f;
-                if (EggHealth < 1.0f / 3.0f) ovulationChance = 0.8f;
-                if (ModsConfig.BiotechActive && xxx.is_human(Pawn))
-                {
-                    if (Pawn.SterileGenes()) return 0.0f;
-                    // Replicate how rjw.PawnCapacityWorker_Fertility.CalculateCapacityLevel does it, but without the age factor
-                    if (!Pawn.RaceHasFertility()) return 0.0f;
-                    if (AndroidsCompatibility.IsAndroid(Pawn) && parent.def != Genital_Helper.archotech_vagina) return 0.0f;
-                    foreach (var part in StatDefOf.Fertility.parts)
-                    {
-                        if(part is StatPart_FertilityByGenderAge fertilityByAge)
-                        {
-                            float factor = 1.0f;
-                            fertilityByAge.TransformValue(StatRequest.For(Pawn), ref factor);
-                            if (factor <= 0.0f) return 0.0f;    // Too young or too old
-                        }
-                        else part.TransformValue(StatRequest.For(Pawn), ref ovulationChance);
-                    }
-                    if (Pawn.HasQuirk(QuirkUtility.Quirks.Breeder)) ovulationChance *= 10.0f;
-                    try
-                    {
-                        calculatingOvulationChance = true;
-                        ovulationChance *= PawnCapacityUtility.CalculateCapacityLevel(Pawn.health.hediffSet, xxx.reproduction);
-                    }
-                    finally { calculatingOvulationChance = false; }
-                }
-                return ovulationChance;
+                if (ovulationChanceCache < 0.0f) ovulationChanceCache = CalcuatedOvulationChance();
+                return ovulationChanceCache;
             }
         }
+
         public float ImplantChance
         {
             get
             {
-                float factor = 1.0f;
-                if (ModsConfig.BiotechActive && xxx.is_human(Pawn))
-                {
-                    // Implant factor will be based solely on pawn age, plus any rollover from ovulation chance
-                    StatPart_FertilityByGenderAge fertilityStatPart = StatDefOf.Fertility.GetStatPart<StatPart_FertilityByGenderAge>();
-                    fertilityStatPart?.TransformValue(StatRequest.For(Pawn), ref factor);
-                    float ovulationOverflow = OvulationChance;
-                    if (ovulationOverflow > 1.0f) factor *= ovulationOverflow;
-                    return Props.baseImplantationChanceFactor * FertilityModifier * factor;
-                }
-                else
-                {
-                    return Pawn.health.capacities.GetLevel(xxx.reproduction) * Props.baseImplantationChanceFactor * FertilityModifier * factor;
-                }
+                if (implantationChanceCache < 0.0f) implantationChanceCache = CalcuatedImplantChance();
+                return implantationChanceCache;
             }
         }
 
@@ -1260,6 +1275,8 @@ namespace RJW_Menstruation
 
         protected virtual void BeforeSimulator()
         {
+            ovulationChanceCache = -1.0f;
+            implantationChanceCache = -1.0f;
             CumOut();
         }