The first time for my wife was when she and a girlfriend (who was in a long term relationshi) went out for drinks and dancing. My wife was a smoke
show that night. Her friend was out with the intent to get laid, and knowing of my cuckold desires, encouraged my wife to find two attractive men to flirt with. They both got their brains fucked out that night.
My wife was highly aroused when she finally got home and told me what they had both done. My imagination vividly illuminated the details.
Ever since, I prefer to hear about it after the fact. The mind can be powerfully erotic.