Very difficult.
But I think it was my wife's gang bang with 10-12 guys.
Because of these guys didn't give her the time to recover from an orgasm, she came almost continuously (her words).
My wife kept talking about this event for weeks, how much she enjoyed it.
She even told me liking a next gang bang with 20 guys.
If I'd asked her beforehand if she'd like to get gang-banged, I was sure she would have said NO.
Just goes to show how far wrong you can be.
And then you've been married to her for almost 40 years...............