This is an unusually blunt post about the cuckolding fantasy:
There really are F/m couples that practice cuckolding successfully. They are rare. And both the man and the woman have considerable emotional maturity and trust. Many women come to despise the man that asks for this. Some wives leave their husband because knowing he wants this is intolerable. [From Your Husband Wants You to Cuckold Him]
Nice to hear it said.