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.
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.