can_take_religious_vows_trigger

can_take_religious_vows_trigger = {
	can_take_religious_vows_disregard_marriage_trigger = yes

	#Do they have the "wrong" marriage type?
	NOR = {
		custom_description = {
			text = is_married_matrilineally
			subject = scope:recipient
			any_spouse = {
				is_female = yes
				matrilinear_marriage = yes
			}
		}
		custom_description = {
			text = is_married_patrilineally
			subject = scope:recipient
			any_spouse = {
				is_male = yes
				patrilinear_marriage = yes
			}
		}
		custom_description = {
			text = matrilinear_betrothal
			subject = scope:recipient
			betrothed ?= {
				is_female = yes
				matrilinear_betrothal = yes
			}
		}
		custom_description = {
			text = patrilinear_betrothal
			subject = scope:recipient
			betrothed ?= {
				is_male = yes
				patrilinear_betrothal = yes
			}
		}
	}
	bp2_valid_for_standard_interactions_trigger = yes
}

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