Mate this obviously total bollocks. Cornette has more enemies than Allardyce has had meat pies, if it were true it would have come out years ago.
Probably a case of Cornette making a crass joke back in the day that 1 or 2 people took literally. To be honest though if it is somehow true, is it really a big deal? Middle-age couple are into swinging, how bizarre. Not my cup of tea but it's hardly noncing or raping.
I mean, the accusations against his wife weren't great. Granted it was her accused of grooming, and not him, but if the shouts of "you had to be with her to get somewhere with him" are provable, he's in trouble.