Added two Genes for changing biological age by sex

Common/Defs/Genes/GeneDefs_SexSpecial.xml

@@ -10,4 +10,24 @@
         <displayOrderInCategory>1</displayOrderInCategory>
     </GeneDef>
     
+    <GeneDef>
+        <defName>rjw_genes_youth_fountain</defName>
+        <label>Youth Fountain</label>
+        <displayCategory>rjw_genes_special</displayCategory>
+        <description>Having sex with a carrier of this gene makes the partner slightly younger. (Partner stays adult)</description>
+        <biostatCpx>1</biostatCpx>
+        <iconPath>UI/Ideoligions/FireLeaves</iconPath>
+        <displayOrderInCategory>2</displayOrderInCategory>
+    </GeneDef>
+    
+    <GeneDef>
+        <defName>rjw_genes_sex_age_drain</defName>
+        <label>Sexual Age Drain</label>
+        <displayCategory>rjw_genes_special</displayCategory>
+        <description>Having sex transfers some of the partners life-time to themselves. (Pawn stays adult)</description>
+        <biostatCpx>1</biostatCpx>
+        <iconPath>UI/Icons/ColonistBar/Idle</iconPath>
+        <displayOrderInCategory>3</displayOrderInCategory>
+    </GeneDef>
+    
 </Defs>

Source/GeneDefOf.cs

@@ -71,6 +71,8 @@ namespace RJW_Genes
 
 		// Special
 		public static readonly GeneDef rjw_genes_orgasm_rush;
+		public static readonly GeneDef rjw_genes_youth_fountain;
+		public static readonly GeneDef rjw_genes_sex_age_drain;
 
 
 		public static readonly HediffDef rjw_genes_orgasm_rush_hediff;

Source/Genes/GeneUtility.cs

@@ -23,6 +23,24 @@ namespace RJW_Genes
             return pawn.genes.HasGene(GeneDefOf.rjw_genes_insectincubator);
         }
 
+        public static bool IsYouthFountain(Pawn pawn)
+        {
+            if (pawn.genes == null)
+            {
+                return false;
+            }
+            return pawn.genes.HasGene(GeneDefOf.rjw_genes_youth_fountain);
+        }
+
+        internal static bool IsAgeDrainer(Pawn pawn)
+        {
+            if (pawn.genes == null)
+            {
+                return false;
+            }
+            return pawn.genes.HasGene(GeneDefOf.rjw_genes_sex_age_drain);
+        }
+
         public static bool IsInsectBreeder(Pawn pawn)
         {
             if (pawn.genes == null)

Source/Genes/Special/Patch_AgeDrain.cs

@@ -0,0 +1,38 @@
+using HarmonyLib;
+using rjw;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RJW_Genes.Genes.Special
+{
+    [HarmonyPatch(typeof(SexUtility), "Aftersex")]
+    public static class Patch_AgeDrain
+    {
+
+        const long AGE_TRANSFERED = 120000; // 120k == 2 days
+
+        // Comment Below in for debugging, changes years
+        // const long AGE_TRANSFERED = 6000000; // 6000k == 100 days
+        public static void Postfix(SexProps props)
+        {
+            if (props == null || props.pawn == null || props.partner == null || props.partner.IsAnimal() )
+            {
+                return;
+            }
+            if (GeneUtility.IsAgeDrainer(props.pawn))
+            {
+                var pawnAge = props.pawn.ageTracker.AgeBiologicalTicks;
+                var pawnMinAge = props.pawn.ageTracker.AdultMinAgeTicks;
+
+                // Make Partner older
+                props.partner.ageTracker.AgeBiologicalTicks += AGE_TRANSFERED;
+                // Make Pawn younger
+                props.pawn.ageTracker.AgeBiologicalTicks = Math.Max(pawnMinAge, pawnAge - AGE_TRANSFERED);
+            }
+
+        }
+    }
+}

Source/Genes/Special/Patch_Youth_Fountain.cs

@@ -0,0 +1,36 @@
+using HarmonyLib;
+using rjw;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RJW_Genes.Genes.Special
+{
+    [HarmonyPatch(typeof(SexUtility), "Aftersex")]
+    public static class Patch_Youth_Fountain
+    {
+
+        const long AGE_REDUCTION = 60000; // 60k == 1 day
+
+        // Comment Below in for debugging
+        //const long AGE_REDUCTION = 6000000; // 6000k == 100 days
+        public static void Postfix(SexProps props)
+        {
+            if (props == null || props.pawn == null || props.partner == null || props.partner.IsAnimal())
+            {
+                return;
+            }
+            if (GeneUtility.IsYouthFountain(props.pawn))
+            {
+                var partnerAge = props.partner.ageTracker.AgeBiologicalTicks;
+                var minAge = props.partner.ageTracker.AdultMinAgeTicks;
+
+                props.partner.ageTracker.AgeBiologicalTicks = Math.Max(minAge, partnerAge - AGE_REDUCTION);
+            }
+
+        }
+
+    }
+}