give_incest_secret_or_nothing_effect

give_incest_secret_or_nothing_effect = {
	save_temporary_scope_as = incest_character
	if = {
		limit = {
			NOR = {
				has_trait = incestuous
				any_secret = { type = secret_incest }
			}
			is_adult = yes
			trait_is_shunned_or_criminal_in_my_or_lieges_rite_trigger = { TRAIT = trait:incestuous GENDER_CHARACTER = scope:incest_character }
		}
		if = {
			limit = {
				is_available_quick = { advanced_ruler = yes }
				NOT = { knows_doctrine = doctrine_consanguinity_unrestricted }
			}
			add_known_doctrine = doctrine_consanguinity_unrestricted
		}
		add_secret = {
			type = secret_incest
		}
		shunned_or_criminal_sf_impact_effect = { TRAIT = trait:incestuous }
	}
}

As written in game/common/scripted_effects/00_secret_effects.txt.