Added a new gene that increases penis size on oral sex

Source/Genes/Special/Defs/HormonalSalivaExtension.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Verse;
+
+namespace RJW_Genes
+{
+    public class HormonalSalivaExtension : DefModExtension
+    {
+        /// <summary>
+        /// How much the genitalia will growth per interaction.
+        /// This is applied "flat", so if you have penis 0.5 and growthRate 0.05 it goes to 0.55, 0.60, 0.65 etc. 
+        /// </summary>
+        public float sizeIncrement;
+        /// <summary>
+        /// Upper Limit for the body size - default should be 2-3
+        /// </summary>
+        public float maxBodySize;
+        /// <summary>
+        /// How much more cum the pawn will make.
+        /// This is applied as multiplication, so if you have cum 20 and multiplier 1.1 you will have 22,24,27 etc. 
+        /// This leads to exponential growth, so try to keep it kinda low. 
+        /// </summary>
+        public float cumMultiplier;
+    }
+}

Source/Genes/Special/Patches/Patch_HormonalSaliva.cs

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+using HarmonyLib;
+using rjw;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Verse;
+
+namespace RJW_Genes
+{
+    [HarmonyPatch(typeof(SexUtility), "Aftersex")]
+    public class Patch_HormonalSaliva
+    {
+        // TODO: Reduce to 0.02 after debug. 
+        const float SIZE_INCREMENT_FALLBACK = 0.02f;
+        const float MAX_BODY_SIZE_FALLBACK = 2.5f;
+        const float CUM_MULTIPLIER_FALLBACK = 1.05f;
+
+        public static void Postfix(SexProps props)
+        {
+            if (props == null || props.pawn == null || props.partner == null || props.partner.IsAnimal())
+            {
+                return;
+            }
+
+            Pawn pawn = props.pawn;
+            Pawn partner = props.partner;
+
+
+            if (GeneUtility.HasGeneNullCheck(pawn, GeneDefOf.rjw_genes_hormonal_saliva) && (props.sexType == xxx.rjwSextype.Oral || props.sexType == xxx.rjwSextype.Sixtynine || props.sexType == xxx.rjwSextype.Fellatio))
+            {
+                GrowPenisses(partner);
+            }
+
+            if (GeneUtility.HasGeneNullCheck(partner, GeneDefOf.rjw_genes_hormonal_saliva) && (props.sexType == xxx.rjwSextype.Oral || props.sexType == xxx.rjwSextype.Sixtynine || props.sexType == xxx.rjwSextype.Fellatio))
+            {
+                GrowPenisses(pawn);
+            }
+
+        }
+
+        private static void GrowPenisses(Pawn pawn)
+        {
+
+            HormonalSalivaExtension salivaExt = GeneDefOf.rjw_genes_hormonal_saliva.GetModExtension<HormonalSalivaExtension>();
+
+            float size_increment = salivaExt?.sizeIncrement ?? SIZE_INCREMENT_FALLBACK;
+            float maximum_body_size = salivaExt?.maxBodySize ?? MAX_BODY_SIZE_FALLBACK;
+            float cum_multiplier = salivaExt?.cumMultiplier ?? CUM_MULTIPLIER_FALLBACK;
+
+
+            List<Hediff> AllPenisses = Genital_Helper.get_AllPartsHediffList(pawn).FindAll(x => Genital_Helper.is_penis(x));
+            foreach (Hediff penis in AllPenisses)
+            {
+                CompHediffBodyPart CompHediff = penis.TryGetComp<rjw.CompHediffBodyPart>();
+                if (penis.Severity < 1.00)
+                {
+                    penis.Severity = Math.Min(1.01f, penis.Severity + size_increment);
+                }
+                else
+                {
+                    if (CompHediff != null && CompHediff.SizeOwner <= maximum_body_size)
+                    {
+                        CompHediff.SizeOwner += size_increment;
+                    }
+                }
+
+                // Increase Fluid
+                if (CompHediff != null)
+                    CompHediff.FluidAmmount *= cum_multiplier;
+            }
+        }
+
+    }
+}