would_attempt_to_seduce_incest_trigger

would_attempt_to_seduce_incest_trigger = {
	trigger_if = {
		limit = {
			save_temporary_scope_as = potential_cheater
			OR = {
				# Checks for incest
				relation_with_character_is_incestuous_in_rite_trigger = {
					RITE = scope:potential_cheater.rite
					CHARACTER = $CHARACTER$
				}
				# Check celibate clergy too since it's a similar overcoming of norms
				AND = {
					is_clergy = yes
					rite = { rite_has_doctrine = doctrine_clerical_marriage_allowed }
				}
			}
		}
		# Isn't god-fearing
		NOT = { has_trait = zealous }
		# Is randy
		has_trait = lustful
		# Takes what they want
		ai_boldness >= medium_positive_ai_value
		# Likes them
		opinion = {
			target = $CHARACTER$
			value >= 25
		}
		# Big attraction or get on very well
		OR = {
			trait_compatibility = {
				target = $CHARACTER$
				value >= medium_positive_trait_compatibility
			}
			$CHARACTER$.attraction >= medium_positive_attraction
		}
	}
}

As written in game/common/scripted_triggers/00_adultery_triggers.txt.