diff --git a/1.4/Defs/PreceptDefs/Precepts_Incest.xml b/1.4/Defs/PreceptDefs/Precepts_Incest.xml
index df0e490..ddcc32a 100644
--- a/1.4/Defs/PreceptDefs/Precepts_Incest.xml
+++ b/1.4/Defs/PreceptDefs/Precepts_Incest.xml
@@ -320,9 +320,6 @@
     <impact>High</impact>
     <displayOrderInIssue>0</displayOrderInIssue>
     <displayOrderInImpact>1000</displayOrderInImpact>
-    <conflictingMemes>
-      <li>Zoophile</li>
-    </conflictingMemes>
     <comps>
       <li Class="PreceptComp_KnowsMemoryThought">
         <eventDef>RSI_NonIncestuosMarriage</eventDef>
diff --git a/Languages/English/Keyed/RJW_Sexperience.xml b/Languages/English/Keyed/RJW_Sexperience.xml
index 9550b00..92fe2bc 100644
--- a/Languages/English/Keyed/RJW_Sexperience.xml
+++ b/Languages/English/Keyed/RJW_Sexperience.xml
@@ -9,4 +9,6 @@
   <RSNotAnimal>not animal</RSNotAnimal>
   <RSShouldCanFuck>capable of sex is required</RSShouldCanFuck>
 
+  <!-- Rewrite vanilla key -->
+  <CantRomanceTargetIncest>forbidden by ideology</CantRomanceTargetIncest>
 </LanguageData>
\ No newline at end of file
diff --git a/Source/IdeologyAddon/BloodRelationDegree.cs b/Source/IdeologyAddon/BloodRelationDegree.cs
new file mode 100644
index 0000000..e23f9ee
--- /dev/null
+++ b/Source/IdeologyAddon/BloodRelationDegree.cs
@@ -0,0 +1,9 @@
+namespace RJWSexperience.Ideology
+{
+	public enum BloodRelationDegree
+	{
+		CloseRelative,
+		FarRelative,
+		NotRelated
+	}
+}
diff --git a/Source/IdeologyAddon/DebugAction.cs b/Source/IdeologyAddon/DebugAction.cs
index 9655f50..91f5b20 100644
--- a/Source/IdeologyAddon/DebugAction.cs
+++ b/Source/IdeologyAddon/DebugAction.cs
@@ -1,5 +1,7 @@
 using rjw;
 using RJWSexperience.Ideology.HistoryEvents;
+using RJWSexperience.Ideology.Patches;
+using System.Collections.Generic;
 using System.Linq;
 using Verse;
 
@@ -16,5 +18,20 @@ namespace RJWSexperience.Ideology
 			RsiHistoryEventDefOf.RSI_NonIncestuosMarriage.RecordEventWithPartner(hero, p);
 			RsiHistoryEventDefOf.RSI_NonIncestuosMarriage.RecordEventWithPartner(p, hero);
 		}
+
+		[DebugAction("RJW Sexperience Ideology", "Manual romance check", false, true, actionType = DebugActionType.Action, allowedGameStates = AllowedGameStates.PlayingOnMap)]
+		public static void DisplayDebugTable()
+		{
+			IEnumerable<Pawn> pawns = Find.CurrentMap.mapPawns.AllPawnsSpawned.Where(pawn => pawn.IsColonist);
+
+			IEnumerable<TableDataGetter<Pawn>> columns = pawns
+				.Select(pawn => new TableDataGetter<Pawn>(pawn.Name.ToStringShort, (Pawn p) => Rimworld_Patch_IncestuousManualRomance.RsiIncestuous(p, pawn)));
+
+			var name = new TableDataGetter<Pawn>("Name", (Pawn pawn) => pawn.Name.ToStringShort);
+
+			TableDataGetter<Pawn>[] getters = (new List<TableDataGetter<Pawn>>() { name }).Concat(columns).ToArray();
+
+			DebugTables.MakeTablesDialog(pawns, getters);
+		}
 	}
 }
diff --git a/Source/IdeologyAddon/IdeoUtility.cs b/Source/IdeologyAddon/IdeoUtility.cs
index 4b44cce..206b8eb 100644
--- a/Source/IdeologyAddon/IdeoUtility.cs
+++ b/Source/IdeologyAddon/IdeoUtility.cs
@@ -12,9 +12,9 @@ namespace RJWSexperience.Ideology
 			if (ideo == null)
 				return false;
 
-			if (ideo.HasPrecept(VariousDefOf.Submissive_Female) && pawn.gender == Gender.Female)
+			if (ideo.HasPrecept(RsiPreceptDefOf.Submissive_Female) && pawn.gender == Gender.Female)
 				return true;
-			else if (ideo.HasPrecept(VariousDefOf.Submissive_Male) && pawn.gender == Gender.Male)
+			else if (ideo.HasPrecept(RsiPreceptDefOf.Submissive_Male) && pawn.gender == Gender.Male)
 				return true;
 
 			return false;
diff --git a/Source/IdeologyAddon/IdeologyAddon.csproj b/Source/IdeologyAddon/IdeologyAddon.csproj
index 651dd5b..0636e40 100644
--- a/Source/IdeologyAddon/IdeologyAddon.csproj
+++ b/Source/IdeologyAddon/IdeologyAddon.csproj
@@ -42,6 +42,7 @@
     <Reference Include="System.Net.Http" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="BloodRelationDegree.cs" />
     <Compile Include="DebugAction.cs" />
     <Compile Include="GlobalSuppressions.cs" />
     <Compile Include="HistoryEvents\DefExtension_SecondaryEvents.cs" />
@@ -59,7 +60,10 @@
     <Compile Include="PreceptWorkers\ThoughtWorker_Precept_Pregnant.cs" />
     <Compile Include="PreceptWorkers\ThoughtWorker_Precept_Pregnant_Social.cs" />
     <Compile Include="RelationFilter.cs" />
+    <Compile Include="RelationHelpers.cs" />
+    <Compile Include="RomanceChanceFactorHelpers.cs" />
     <Compile Include="RsiHistoryEventDefOf.cs" />
+    <Compile Include="RsiPreceptDefOf.cs" />
     <Compile Include="TwoPawnFilter.cs" />
     <Compile Include="SinglePawnFilter.cs" />
     <Compile Include="Precepts\Comp_SelfTookMemoryThought_Gendered.cs" />
@@ -94,7 +98,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Krafs.Rimworld.Ref">
-      <Version>1.4.3537</Version>
+      <Version>1.4.3542</Version>
     </PackageReference>
     <PackageReference Include="Lib.Harmony">
       <Version>2.2.2</Version>
diff --git a/Source/IdeologyAddon/Patches/RJW_Patch_Ideo.cs b/Source/IdeologyAddon/Patches/RJW_Patch_Ideo.cs
index f387f14..e52b361 100644
--- a/Source/IdeologyAddon/Patches/RJW_Patch_Ideo.cs
+++ b/Source/IdeologyAddon/Patches/RJW_Patch_Ideo.cs
@@ -213,14 +213,14 @@ namespace RJWSexperience.Ideology.Patches
 			Ideo mainideo = playerfaction.ideos.PrimaryIdeo;
 			if (mainideo != null)
 			{
-				if (mainideo.HasPrecept(VariousDefOf.BabyFaction_AlwaysFather))
+				if (mainideo.HasPrecept(RsiPreceptDefOf.BabyFaction_AlwaysFather))
 				{
 					Pawn parent = baby.GetFather() ?? baby.GetMother();
 
 					ideo = parent.Ideo;
 					return parent.Faction;
 				}
-				else if (mainideo.HasPrecept(VariousDefOf.BabyFaction_AlwaysColony))
+				else if (mainideo.HasPrecept(RsiPreceptDefOf.BabyFaction_AlwaysColony))
 				{
 					ideo = mainideo;
 					return playerfaction;
@@ -241,7 +241,7 @@ namespace RJWSexperience.Ideology.Patches
 			if (props.pawn?.Ideo == null || !props.hasPartner())
 				return;
 
-			if (props.partner.Ideo?.HasPrecept(VariousDefOf.ProselyzingByOrgasm) == true)
+			if (props.partner.Ideo?.HasPrecept(RsiPreceptDefOf.ProselyzingByOrgasm) == true)
 			{
 				// Pawn is the one having the orgasm
 				// Partner is "giving" the orgasm, hence the pawn will be converted towards the partners ideology
diff --git a/Source/IdeologyAddon/Patches/Rimworld_Patch.cs b/Source/IdeologyAddon/Patches/Rimworld_Patch.cs
index e50098e..55f3ba6 100644
--- a/Source/IdeologyAddon/Patches/Rimworld_Patch.cs
+++ b/Source/IdeologyAddon/Patches/Rimworld_Patch.cs
@@ -4,6 +4,7 @@ using rjw;
 using RJWSexperience.Ideology.HistoryEvents;
 using RJWSexperience.Ideology.Precepts;
 using System.Collections.Generic;
+using System.Linq;
 using Verse;
 
 namespace RJWSexperience.Ideology.Patches
@@ -53,4 +54,55 @@ namespace RJWSexperience.Ideology.Patches
 			}
 		}
 	}
+
+	public static class Rimworld_Patch_IncestuousManualRomance
+	{
+		/// <summary>
+		/// Override incestuous check in the manual romance
+		/// </summary>
+		/// <param name="one">Pawn to try do romance</param>
+		/// <param name="two">Target for romance</param>
+		/// <param name="__result">Result of the original method</param>
+		/// <returns>Run original method implementation</returns>
+		[HarmonyPatch(typeof(RelationsUtility), "Incestuous")]
+		public static bool Prefix(Pawn one, Pawn two, ref bool __result)
+		{
+			__result = RsiIncestuous(one, two);
+			return false;
+		}
+
+		/// <summary>
+		/// Check if Ideology allows romance attempt
+		/// </summary>
+		/// <param name="one">Pawn to try do romance</param>
+		/// <param name="two">Target for romance</param>
+		/// <returns>Forbid romance option</returns>
+		public static bool RsiIncestuous(Pawn one, Pawn two)
+		{
+			PreceptDef incestuousPrecept = one.Ideo?.PreceptsListForReading.Select(precept => precept.def).FirstOrFallback(def => def.issue == VariousDefOf.Incestuos);
+			BloodRelationDegree relationDegree = RelationHelpers.GetBloodRelationDegree(one, two);
+
+			if (incestuousPrecept == null ||
+				incestuousPrecept == RsiPreceptDefOf.Incestuos_Disapproved ||
+				incestuousPrecept == RsiPreceptDefOf.Incestuos_Forbidden)
+			{
+				return relationDegree < BloodRelationDegree.NotRelated;
+			}
+			else if (incestuousPrecept == RsiPreceptDefOf.Incestuos_Free)
+			{
+				return false;
+			}
+			else if (incestuousPrecept == RsiPreceptDefOf.Incestuos_Disapproved_CloseOnly)
+			{
+				return relationDegree == BloodRelationDegree.CloseRelative;
+			}
+			else if (incestuousPrecept == RsiPreceptDefOf.Incestuos_IncestOnly)
+			{
+				return relationDegree == BloodRelationDegree.NotRelated;
+			}
+
+			// Modded incestuous precept?
+			return true;
+		}
+	}
 }
diff --git a/Source/IdeologyAddon/RelationHelpers.cs b/Source/IdeologyAddon/RelationHelpers.cs
new file mode 100644
index 0000000..2a5fe77
--- /dev/null
+++ b/Source/IdeologyAddon/RelationHelpers.cs
@@ -0,0 +1,47 @@
+using RimWorld;
+using System.Linq;
+using Verse;
+
+namespace RJWSexperience.Ideology
+{
+	public static class RelationHelpers
+	{
+		/// <summary>
+		/// Get degree of blood relation between two pawns
+		/// </summary>
+		public static BloodRelationDegree GetBloodRelationDegree(Pawn pawn, Pawn partner)
+		{
+			PawnRelationDef closestBloodRelation = pawn
+				.GetRelations(partner)
+				?.Where(def => def.familyByBloodRelation)
+				?.OrderByDescending(def => def.importance)
+				?.FirstOrFallback();
+
+			if (closestBloodRelation == null)
+			{
+				return BloodRelationDegree.NotRelated;
+			}
+
+			return GetBloodRelationDegree(closestBloodRelation);
+		}
+
+		/// <summary>
+		/// Get degree of blood relation for a relationDef
+		/// </summary>
+		public static BloodRelationDegree GetBloodRelationDegree(PawnRelationDef relationDef)
+		{
+			if (!relationDef.familyByBloodRelation)
+			{
+				return BloodRelationDegree.NotRelated;
+			}
+			else if (relationDef.importance <= PawnRelationDefOf.Cousin.importance)
+			{
+				return BloodRelationDegree.FarRelative;
+			}
+			else
+			{
+				return BloodRelationDegree.CloseRelative;
+			}
+		}
+	}
+}
diff --git a/Source/IdeologyAddon/Rituals/RitualRoles.cs b/Source/IdeologyAddon/Rituals/RitualRoles.cs
index 0d26048..691bb28 100644
--- a/Source/IdeologyAddon/Rituals/RitualRoles.cs
+++ b/Source/IdeologyAddon/Rituals/RitualRoles.cs
@@ -92,7 +92,7 @@ namespace RJWSexperience.Ideology
 
         public static bool CanBeBreeder(Pawn animal, Precept_Ritual precept)
         {
-			if (precept != null && precept.ideo.HasPrecept(VariousDefOf.Bestiality_OnlyVenerated) && !precept.ideo.IsVeneratedAnimal(animal))
+			if (precept != null && precept.ideo.HasPrecept(RsiPreceptDefOf.Bestiality_OnlyVenerated) && !precept.ideo.IsVeneratedAnimal(animal))
 			{
 				return false;
 			}
diff --git a/Source/IdeologyAddon/RomanceChanceFactorHelpers.cs b/Source/IdeologyAddon/RomanceChanceFactorHelpers.cs
new file mode 100644
index 0000000..298916c
--- /dev/null
+++ b/Source/IdeologyAddon/RomanceChanceFactorHelpers.cs
@@ -0,0 +1,108 @@
+using RimWorld;
+using System.Collections.Generic;
+using System.Linq;
+using Verse;
+
+namespace RJWSexperience.Ideology
+{
+	public static class RomanceChanceFactorHelpers
+	{
+		/// <summary>
+		/// Default value for parent relation
+		/// </summary>
+		private const float parentRomanceChanceFactor = 0.03f;
+
+		/// <summary>
+		/// Get ideology adjusted romanceChanceFactor
+		/// </summary>
+		public static float GetRomanceChanceFactor(Pawn pawn, Pawn partner)
+		{
+			IEnumerable<PawnRelationDef> relations = pawn.GetRelations(partner).Where(def => def.familyByBloodRelation);
+			PreceptDef incestuousPrecept = pawn.Ideo?.PreceptsListForReading.Select(precept => precept.def).FirstOrFallback(def => def.issue == VariousDefOf.Incestuos);
+			float romanceChanceFactor = 1f;
+
+			if (!relations.Any())
+			{
+				if (incestuousPrecept == RsiPreceptDefOf.Incestuos_IncestOnly)
+				{
+					return parentRomanceChanceFactor;
+				}
+				else
+				{
+					return romanceChanceFactor;
+				}
+			}
+
+			foreach (PawnRelationDef relationDef in relations)
+			{
+				romanceChanceFactor *= GetRomanceChanceFactor(relationDef, incestuousPrecept);
+			}
+
+			return romanceChanceFactor;
+		}
+
+		/// <summary>
+		/// Get ideology adjusted romanceChanceFactor for the relation
+		/// </summary>
+		public static float GetRomanceChanceFactor(PawnRelationDef relationDef, PreceptDef incestuousPrecept)
+		{
+			if (incestuousPrecept == null || incestuousPrecept == RsiPreceptDefOf.Incestuos_Disapproved) // Default game setup
+			{
+				return relationDef.romanceChanceFactor;
+			}
+
+			if (incestuousPrecept == RsiPreceptDefOf.Incestuos_Free)
+			{
+				return 1f;
+			}
+			else if (incestuousPrecept == RsiPreceptDefOf.Incestuos_Disapproved_CloseOnly)
+			{
+				if (relationDef.familyByBloodRelation && relationDef.importance > PawnRelationDefOf.Cousin.importance)
+				{
+					return relationDef.romanceChanceFactor;
+				}
+				else
+				{
+					return 1f;
+				}
+			}
+			else if (incestuousPrecept == RsiPreceptDefOf.Incestuos_Forbidden)
+			{
+				if (relationDef.familyByBloodRelation)
+				{
+					return parentRomanceChanceFactor;
+				}
+			}
+			else if (incestuousPrecept == RsiPreceptDefOf.Incestuos_IncestOnly)
+			{
+				if (!relationDef.familyByBloodRelation)
+				{
+					return parentRomanceChanceFactor;
+				}
+				else
+				{
+					return 1f;
+				}
+			}
+
+			return relationDef.romanceChanceFactor;
+		}
+
+		[DebugAction("RJW Sexperience Ideology", "Show romanceChanceFactors", false, true, actionType = DebugActionType.Action, allowedGameStates = AllowedGameStates.Entry)]
+		public static void DisplayDebugTable()
+		{
+			IEnumerable<PreceptDef> incestuousPrecepts = DefDatabase<PreceptDef>
+				.AllDefsListForReading
+				.Where(def => def.issue == VariousDefOf.Incestuos);
+
+			IEnumerable<TableDataGetter<PawnRelationDef>> preceptGetters = incestuousPrecepts
+				.Select(precept => new TableDataGetter<PawnRelationDef>(precept.defName,(PawnRelationDef rel) => GetRomanceChanceFactor(rel, precept)));
+
+			var relName = new TableDataGetter<PawnRelationDef>("Relation Def", (PawnRelationDef rel) => rel.defName);
+
+			TableDataGetter<PawnRelationDef>[] getters = (new List<TableDataGetter<PawnRelationDef>>() { relName }).Concat(preceptGetters).ToArray();
+
+			DebugTables.MakeTablesDialog(DefDatabase<PawnRelationDef>.AllDefsListForReading, getters);
+		}
+	}
+}
\ No newline at end of file
diff --git a/Source/IdeologyAddon/RsiHistoryEventDefOf.cs b/Source/IdeologyAddon/RsiHistoryEventDefOf.cs
index 0155d66..4cb9bc7 100644
--- a/Source/IdeologyAddon/RsiHistoryEventDefOf.cs
+++ b/Source/IdeologyAddon/RsiHistoryEventDefOf.cs
@@ -5,14 +5,14 @@ namespace RJWSexperience.Ideology
 	[DefOf]
 	public static class RsiHistoryEventDefOf
 	{
-		[MayRequireIdeology] public static readonly HistoryEventDef RSI_SexWithAnimal;
-		[MayRequireIdeology] public static readonly HistoryEventDef RSI_Raped;
-		[MayRequireIdeology] public static readonly HistoryEventDef RSI_NonIncestuosMarriage;
-		[MayRequireIdeology] public static readonly HistoryEventDef RSI_NonIncestuosSex;
-		[MayRequireIdeology] public static readonly HistoryEventDef RSI_SexWithCorpse;
-		[MayRequireIdeology] public static readonly HistoryEventDef RSI_VirginTaken;
-		[MayRequireIdeology] public static readonly HistoryEventDef RSI_VirginStolen;
-		[MayRequireIdeology] public static readonly HistoryEventDef RSI_TookVirgin;
-		[MayRequireIdeology] public static readonly HistoryEventDef RSI_Masturbated;
+		public static readonly HistoryEventDef RSI_SexWithAnimal;
+		public static readonly HistoryEventDef RSI_Raped;
+		public static readonly HistoryEventDef RSI_NonIncestuosMarriage;
+		public static readonly HistoryEventDef RSI_NonIncestuosSex;
+		public static readonly HistoryEventDef RSI_SexWithCorpse;
+		public static readonly HistoryEventDef RSI_VirginTaken;
+		public static readonly HistoryEventDef RSI_VirginStolen;
+		public static readonly HistoryEventDef RSI_TookVirgin;
+		public static readonly HistoryEventDef RSI_Masturbated;
 	}
 }
diff --git a/Source/IdeologyAddon/RsiPreceptDefOf.cs b/Source/IdeologyAddon/RsiPreceptDefOf.cs
new file mode 100644
index 0000000..977954a
--- /dev/null
+++ b/Source/IdeologyAddon/RsiPreceptDefOf.cs
@@ -0,0 +1,20 @@
+using RimWorld;
+
+namespace RJWSexperience.Ideology
+{
+	[DefOf]
+	public static class RsiPreceptDefOf
+	{
+		public static readonly PreceptDef Incestuos_Free;
+		public static readonly PreceptDef Incestuos_Disapproved_CloseOnly;
+		public static readonly PreceptDef Incestuos_Disapproved;
+		public static readonly PreceptDef Incestuos_Forbidden;
+		public static readonly PreceptDef Incestuos_IncestOnly;
+		public static readonly PreceptDef Bestiality_OnlyVenerated;
+		public static readonly PreceptDef BabyFaction_AlwaysFather;
+		public static readonly PreceptDef BabyFaction_AlwaysColony;
+		public static readonly PreceptDef Submissive_Male;
+		public static readonly PreceptDef Submissive_Female;
+		public static readonly PreceptDef ProselyzingByOrgasm;
+	}
+}
\ No newline at end of file
diff --git a/Source/IdeologyAddon/VariousDefOf.cs b/Source/IdeologyAddon/VariousDefOf.cs
index fb926ce..19a104d 100644
--- a/Source/IdeologyAddon/VariousDefOf.cs
+++ b/Source/IdeologyAddon/VariousDefOf.cs
@@ -13,15 +13,10 @@ namespace RJWSexperience.Ideology
 		public static readonly JobDef GettinDrugSex;
 		public static readonly JobDef DrugMasturbate;
 
-		[MayRequireIdeology] public static readonly MemeDef Zoophile;
-		[MayRequireIdeology] public static readonly MemeDef Rapist;
-		[MayRequireIdeology] public static readonly MemeDef Necrophile;
-		[MayRequireIdeology] public static readonly PreceptDef Bestiality_OnlyVenerated;
-		[MayRequireIdeology] public static readonly PreceptDef BabyFaction_AlwaysFather;
-		[MayRequireIdeology] public static readonly PreceptDef BabyFaction_AlwaysColony;
-		[MayRequireIdeology] public static readonly PreceptDef Submissive_Male;
-		[MayRequireIdeology] public static readonly PreceptDef Submissive_Female;
-		[MayRequireIdeology] public static readonly PreceptDef ProselyzingByOrgasm;
+		public static readonly MemeDef Zoophile;
+		public static readonly MemeDef Rapist;
+		public static readonly MemeDef Necrophile;
+		public static readonly IssueDef Incestuos;
 		[MayRequireBiotech] public static readonly HediffDef PregnantHuman;
 	}
 }