diff --git a/1.3/source/RJW_Menstruation/RJW_Menstruation/Cum.cs b/1.3/source/RJW_Menstruation/RJW_Menstruation/Cum.cs
index 2976f05..bb360e6 100644
--- a/1.3/source/RJW_Menstruation/RJW_Menstruation/Cum.cs
+++ b/1.3/source/RJW_Menstruation/RJW_Menstruation/Cum.cs
@@ -11,8 +11,7 @@ namespace RJW_Menstruation
         public Pawn pawn;
 
         protected float volume; // ml
-        protected float fertvolume;
-        public float fertFactor = 1.0f;
+        public float fertility = 1.0f;
         public bool notcum = false; // for other fluids
         public string notcumLabel = "";
         protected bool useCustomColor = false;
@@ -32,7 +31,7 @@ namespace RJW_Menstruation
         {
             get
             {
-                return fertvolume;
+                return volume * fertility;
             }
         }
 
@@ -130,7 +129,7 @@ namespace RJW_Menstruation
         {
             this.pawn = pawn;
             volume = 1.0f;
-            fertvolume = 1.0f;
+            fertility = 1.0f;
         }
 
         /// <summary>
@@ -145,7 +144,7 @@ namespace RJW_Menstruation
         {
             this.pawn = pawn;
             this.volume = volume;
-            this.fertvolume = volume;
+            this.fertility = 0f;
             this.notcum = true;
             this.notcumLabel = notcumlabel;
             this.notcumthickness = decayresist;
@@ -156,7 +155,7 @@ namespace RJW_Menstruation
         {
             this.pawn = pawn;
             this.volume = volume;
-            this.fertvolume = volume * fertility;
+            this.fertility = fertility;
             this.filthDef = filthDef;
         }
 
@@ -167,9 +166,8 @@ namespace RJW_Menstruation
             Scribe_References.Look(ref pawn, "pawn", true);
             Scribe_References.Look(ref internalThing, "internalThing", true);
             Scribe_Values.Look(ref volume, "volume", volume, true);
-            Scribe_Values.Look(ref fertvolume, "fertvolume", fertvolume, true);
+            Scribe_Values.Look(ref fertility, "fertility", fertility, true);
             Scribe_Values.Look(ref notcumthickness, "notcumthickness", notcumthickness, true);
-            Scribe_Values.Look(ref fertFactor, "fertFactor", fertFactor, true);
             Scribe_Values.Look(ref notcum, "notcum", notcum, true);
             Scribe_Values.Look(ref notcumLabel, "notcumLabel", notcumLabel, true);
             Scribe_Values.Look(ref useCustomColor, "useCustomColor", useCustomColor, true);
@@ -187,7 +185,7 @@ namespace RJW_Menstruation
         {
             if (updatefilthDef != null) filthDef = updatefilthDef;
             volume += volumein;
-            fertvolume += volumein*fertility;
+            this.fertility = (this.volume * this.fertility + volumein * fertility) / (this.volume + volumein);
             cumthickness = Mathf.Lerp(cumthickness, 1.0f, volumein / volume);
         }
 
@@ -195,12 +193,13 @@ namespace RJW_Menstruation
         {
             if (updatefilthDef != null) filthDef = updatefilthDef;
             volume += volumein;
+            fertility = volume * fertility / (volume + volumein);
             notcumthickness = Mathf.Lerp(notcumthickness, thickness, volumein / volume);
         }
 
         public bool ShouldRemove()
         {
-            if ((notcum || fertvolume < 0.001f) && volume < 0.01f) return true;
+            if ((notcum || FertVolume < 0.001f) && volume < 0.01f) return true;
             return false;
         }
 
@@ -209,7 +208,7 @@ namespace RJW_Menstruation
         {
             float totalleak = volume;
             volume *= Math.Max(0, (1 - (Configurations.CumDecayRatio * (1 - DecayResist)) * leakfactor));
-            fertvolume *= Math.Max(0, 1 - (Configurations.CumFertilityDecayRatio * (1 - DecayResist) + antisperm));
+            fertility *= Math.Max(0, 1 - (Configurations.CumFertilityDecayRatio * (1 - DecayResist) + antisperm));
             CutMinor();
             totalleak -= volume;
             return totalleak;
@@ -219,7 +218,6 @@ namespace RJW_Menstruation
         {
             float totalleak = volume;
             volume *= Math.Max(0, 1 - (portion * (1 - DecayResist/10)) * leakfactor);
-            fertvolume *= Math.Max(0, 1 - (portion * (1 - DecayResist)) * leakfactor);
             CutMinor();
             totalleak -= volume;
             return totalleak;
@@ -241,7 +239,6 @@ namespace RJW_Menstruation
         protected void CutMinor()
         {
             if (volume < 0.01f) volume = 0f;
-            if (fertvolume < 0.001f) fertvolume = 0f;
         }