diff --git a/src/Collision/NarrowPhase.cs b/src/Collision/NarrowPhase.cs
index 06cea63..ddad6e9 100644
--- a/src/Collision/NarrowPhase.cs
+++ b/src/Collision/NarrowPhase.cs
@@ -38,7 +38,7 @@ namespace MoonWorks.Collision
 			var firstAABB = rectangleA.TransformedAABB(transformA);
 			var secondAABB = rectangleB.TransformedAABB(transformB);
 
-			return firstAABB.Left <= secondAABB.Right && firstAABB.Right >= secondAABB.Left && firstAABB.Top <= secondAABB.Bottom && firstAABB.Bottom >= secondAABB.Top;
+			return firstAABB.Left < secondAABB.Right && firstAABB.Right > secondAABB.Left && firstAABB.Top < secondAABB.Bottom && firstAABB.Bottom > secondAABB.Top;
 		}
 
 		public static bool TestPointRectangleOverlap(Point point, Transform2D pointTransform, Rectangle rectangle, Transform2D rectangleTransform)
@@ -46,7 +46,7 @@ namespace MoonWorks.Collision
 			var transformedPoint = pointTransform.Position;
 			var AABB = rectangle.TransformedAABB(rectangleTransform);
 
-			return transformedPoint.X >= AABB.Left && transformedPoint.X <= AABB.Right && transformedPoint.Y <= AABB.Bottom && transformedPoint.Y >= AABB.Top;
+			return transformedPoint.X > AABB.Left && transformedPoint.X < AABB.Right && transformedPoint.Y < AABB.Bottom && transformedPoint.Y > AABB.Top;
 		}
 
 		public static bool TestCircleOverlap(Circle circleA, Transform2D transformA, Circle circleB, Transform2D transformB)
@@ -60,7 +60,7 @@ namespace MoonWorks.Collision
 			var distanceSquared = (centerA - centerB).LengthSquared();
 			var radiusSumSquared = (radiusA + radiusB) * (radiusA + radiusB);
 
-			return distanceSquared <= radiusSumSquared;
+			return distanceSquared < radiusSumSquared;
 		}
 
 		public static (bool, Simplex2D) FindCollisionSimplex(IShape2D shapeA, Transform2D transformA, IShape2D shapeB, Transform2D transformB)