fix for cum error when having sex at age 0

Source/Common/SexUtility.cs

@@ -456,6 +456,9 @@ namespace rjw
 			float age_scaling = humanLifespan / pawnLifespan;
 			float scaled_age = pawnAge * age_scaling;
 
+			if (scaled_age < 1)
+				scaled_age = 1;
+
 			return (int)scaled_age;
 		}