extramarital_sex_discovery_consequences_with_target_effect

extramarital_sex_discovery_consequences_with_target_effect = {
	save_temporary_scope_as = sex_character

	# If the discoverer is my partner
	if = {
		limit = {
			OR = {
				is_consort_of = $DISCOVERER$
				has_relation_lover = $DISCOVERER$
				has_relation_soulmate = $DISCOVERER$
			}
		}

		#Spouse and lover opinions
		$DISCOVERER$ = {
			if = {
				limit = {
					has_relation_soulmate = scope:sex_character
					soulmate_relation_is_exclusive_trigger = yes
					NOT = { $TARGET$ = $DISCOVERER$ }
				}
				add_opinion = {
					target = scope:sex_character
					modifier = betrayed_our_promise
				}
			}

			if = {
				limit = {
					is_consort_of = scope:sex_character
					accepts_adultery_without_penalty_trigger = no
				}
				add_opinion = {
					target = scope:sex_character
					modifier = unfaithful_spouse_discovered_opinion
				}
			}
		}
	}

	# If the discoverer is my sex partner's spouse
	if = {
		limit = {
			$TARGET$ = {
				is_consort_of = $DISCOVERER$
			}
		}
		$DISCOVERER$ = {
			if = {
				limit = { accepts_adultery_without_penalty_trigger = no }
				add_opinion = {
					target = scope:sex_character
					modifier = slept_with_spouse_discovered_opinion
				}
			}
		}
	}
}

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