I wonder if he had anything to do with the now defunct website
www.dunkingstool.com? If you google his online name "dunkingstool", you have no trouble bumping into an apparently large network of people with underwater sex fetishes. Aquaxxx.com is just one of them, and it links to the dunkingstool.com site. For what it is worth, historically there was a real torture device called the dunking stool, so he could have arrived at his online name in other ways, but I would just bet you he has posted and participated in the easily discovered online world of underwater fetish information.