در دین زرتشتی، پدر حق دارد به زور با دخترش همبستر شود. و برادر با خواهرش: ر «روایت آذرفرنبغ فرخزادان» آمده است که اگر دختری راضی به ازدواج با پدرش نشود، پدر می‌تواند به زور با او هم‌بستر شود! در فتوای بیستم از روایت آذرفرنبغ فرخزادان می‌خوانیم: Q: There is a man whom it behooves that he should give his daughter or his sister in marriage;‎ they do not agree;‎ can that man hand them over in marriage with force?‎ If he does, will the meritorious work of the holy communion come into being, or not ?‎ A: As I understand: it is proper to hand over a sister or a daughter as wife, in that way, with force;‎ if one does it, the marriage is appropriate, and the meritorious work of the holy communion does come into being;‎ it is not proper to do it if the husband does not agree, and it is a sin.‎