I would have to ask if anyone believes it possible that a “group” of people who would constitute a sex party would, to a man, keep a thing like this secret. Doesn’t seem plausible to me.
The Vatican has kept much uglier secrets than this.
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These would be people used to keeping very personal confessions confidential. And they are not stupid men.
While I hope this is not true, I think it is quite plausible to keep that secret for years.