infidelity_confrontation_story_add_to_list_effect

infidelity_confrontation_story_add_to_list_effect = {
	save_temporary_scope_as = checked_confronting_partner
	if = {
		limit = {
			NOR = {
				this = $LOVER_1$
				this = $LOVER_2$
				scope:infidelity_story = {
					is_target_in_variable_list = {
						name = confronting_partners
						target = scope:checked_confronting_partner
					}
				}
			}
			#Exempt polyamorous spouses.
			accepts_adultery_without_penalty_trigger = no
		}
		scope:infidelity_story = {
			add_to_variable_list = {
				name = confronting_partners
				target = scope:checked_confronting_partner
			}
		}
	}
}

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