Added a Gene for Specified Sex using RJW Logic

Source/Genes/Gender/GenderUtility.cs

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+using Verse;
+using rjw;
+using RimWorld;
+using System.Collections;
+using System.Linq;
+using System;
+
+namespace RJW_Genes
+{
+    public class GenderUtility
+    {
+        /// <summary>
+        /// Returns if a Pawn is female (Gender==Female) or if it should be (Gene==FemaleOnly)
+        /// This is used as a small helper, as the genes might fire in different orders.
+        /// </summary>
+        public static bool IsFemale(Pawn pawn)
+        {
+            return
+                pawn.gender == Gender.Female || pawn.genes.GenesListForReading.Any(gene => gene.def.defName.EqualsIgnoreCase(GeneDefOf.rjw_genes_female_only.defName));
+        }
+
+        /// <summary>
+        /// Returns if a Pawn is male (Gender==Male) or if it should be (Gene==MaleOnly)
+        /// This is used as a small helper, as the genes might fire in different orders.
+        /// </summary>
+        public static bool IsMale(Pawn pawn)
+        {
+            return
+                pawn.gender == Gender.Male || pawn.genes.GenesListForReading.Any(gene => gene.def.defName.EqualsIgnoreCase(GeneDefOf.rjw_genes_male_only.defName));
+        }
+
+        /// <summary>
+        /// Adjusts the Body Type to match the given target gender 
+        /// (for male and female only, baby,child and hulks don't change)
+        /// </summary>
+        /// <param name="pawn"></param>
+        /// <param name="targetGender"></param>
+        public static void AdjustBodyToTargetGender(Pawn pawn, Gender targetGender)
+        {
+            if (pawn == null)
+                return;
+            if (pawn.story.bodyType == BodyTypeDefOf.Baby || pawn.story.bodyType == BodyTypeDefOf.Hulk || pawn.story.bodyType == BodyTypeDefOf.Child)
+                return;
+
+            if (targetGender == Gender.Male)
+            {
+                pawn.story.bodyType = BodyTypeDefOf.Male;
+            }
+            else if (targetGender == Gender.Female)
+            {
+                pawn.story.bodyType = BodyTypeDefOf.Female; 
+                pawn.style.beardDef = BeardDefOf.NoBeard;
+            }
+
+            // Re-Choose heads if it is wrong gender
+            if (pawn.story.headType.gender == Gender.None || pawn.story.headType.gender == targetGender)
+            {
+                // Do nothing, Gender of Heat is Neutral or matches
+            }
+            else
+            {
+                // Below line tries to get (and set) an available head from the backstory, if it returns true everything worked if it returns false we log it
+                if(! pawn.story.TryGetRandomHeadFromSet(DefDatabase<HeadTypeDef>.AllDefs.Where((Func<HeadTypeDef, bool>)(x => x.randomChosen))))
+                {
+                    Log.Message("Failed to retrieve a correct-gender head for the pawn " + pawn.Name);
+                };
+            } 
+
+            // Force Redraw at the spot
+            pawn.Drawer.renderer.graphics.SetAllGraphicsDirty();
+        }
+    }
+}

Source/Genes/Gender/Gene_FemaleOnly.cs

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+using Verse;
+using rjw;
+
+
+namespace RJW_Genes
+{
+    public class Gene_FemaleOnly : Gene
+    {
+        public override void PostMake()
+        {
+            base.PostMake();
+
+            AdjustPawnToFemale();
+            // Here we call Sexualization after the Sex-Change
+            if (GenitaliaUtility.PawnStillNeedsGenitalia(pawn))
+                Sexualizer.sexualize_pawn(pawn);
+        }
+
+        public override void PostAdd()
+        {
+            base.PostMake();
+            AdjustPawnToFemale();
+        }
+
+        private void AdjustPawnToFemale()
+        {
+            // Here we really use the Gender.Female and not our helper IsFemale(pawn)
+            if (pawn.gender == Gender.Female)
+                return;
+            else
+            {
+                GenderHelper.ChangeSex(pawn, () => { 
+                    pawn.gender = Gender.Female;
+                    GenitaliaChanger.RemoveAllGenitalia(pawn);
+                    Sexualizer.sexualize_pawn(pawn);
+                });
+                GenderUtility.AdjustBodyToTargetGender(pawn, Gender.Female);
+            }
+        }
+
+    }
+}

Source/Genes/Gender/Gene_MaleOnly.cs

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+using Verse;
+using rjw;
+
+
+namespace RJW_Genes
+{
+    public class Gene_MaleOnly : Gene
+    {
+        public override void PostMake()
+        {
+            base.PostMake();
+
+            AdjustPawnToMale();
+            // Here we call Sexualization after the Sex-Change
+            if (GenitaliaUtility.PawnStillNeedsGenitalia(pawn))
+                Sexualizer.sexualize_pawn(pawn);
+        }
+
+        public override void PostAdd()
+        {
+            base.PostMake();
+            AdjustPawnToMale();
+        }
+
+        private void AdjustPawnToMale()
+        {
+            if (pawn.gender == Gender.Male)
+                return;
+            else
+            {
+                GenderHelper.ChangeSex(pawn, () => {
+
+                    pawn.gender = Gender.Male;
+                    GenitaliaChanger.RemoveAllGenitalia(pawn);
+                    Sexualizer.sexualize_pawn(pawn);
+                });
+                GenderUtility.AdjustBodyToTargetGender(pawn, Gender.Male);
+            }
+        }
+
+    }
+}