code:

character_event = {
        id = 3520
        desc = EVTDESC3520
        picture = GFX_evt_quarrel

        min_age = 16
        capable_only = yes
        prisoner = no

        is_triggered_only = yes

        trigger = {
                trait = celibate
                war = no
                in_command = no
                fertility = 0.4
                has_lover = no
                religion_group = christian
                OR = {
                        trait = chaste
                        piety = 50
                        trait = humble
                }
                is_married = yes
                spouse = {
                        is_alive = yes
                        is_abroad = no
                        prisoner = no
                        has_lover = no
                        is_pregnant = no
                        OR = {
                                trait = lustful
                                trait = hedonist
                                NOT = {
                                        trait = chaste
                                }
                                NOT = {
                                        trait = celibate
                                }
                        }
                }
        }

        weight_multiplier = {
                factor = 1

                modifier = {
                        factor = 0.5
                        trait = wroth
                }

                modifier = {
                        factor = 2
                        diplomacy = 8
                }
        }

        option = {
                name = EVTOPTA3520
                piety = 10
                spouse = {
                        character_event = {
                                id = 3521
                                days = 2
                                tooltip = EVTTOOLTIP3521
                        }
                        opinion = {
                                modifier = opinion_spurned
                                who = ROOT
                                years = 5
                        }
                }
        }
        option = {
                name = EVTOPTB3520
                remove_trait = celibate
                piety = -10
                spouse = {
                        add_lover = ROOT
                }
        }
        option = {
                name = EVTOPTC3520
                trigger = {
                        fertility = 0.5
                        OR = {
                                spouse = {
                                        is_alive = yes
                                        is_abroad = no
                                        fertility = 0.5
                                        reverse_opinion = { who = ROOT value = 30 }
                                }
                                spouse = {
                                        is_alive = yes
                                        is_abroad = no
                                        fertility = 0.5
                                        opinion = { who = ROOT value = 30 }
                                }
                        }
                }
                remove_trait = celibate
                piety = -10
                spouse = {
                        add_lover = ROOT
                }
                random = {
                        chance = 20
                        random_spouse = {
                                limit = {
                                        OR = {
                                                ROOT = {
                                                        is_female = yes
                                                        NOT = { age = 45 }
                                                        fertility = 0.2
                                                }
                                                AND = {
                                                        is_female = yes
                                                        NOT = { age = 45 }
                                                        fertility = 0.2
                                                }
                                        }
                                }
                                impregnate = ROOT
                        }
                }
        }
}