Wouldn't it be trivial to perform some sort of analysis on this? That is, write a script to test an appropriately sized sample for domain availability. Then after some predetermined time, check the availability again. I'd imagine if GoDaddy is registering domains, then we'd find that our data was statistically significant.
You could just crowd source it. When you quickly back out of a page from Google, it offers to "Block all Pages from somedomain.com". This could easily be repurposed to also garner additional details about the site.
I highly doubt anything would come of it. If it did, it would be pretty easy to explain. Nonetheless, having .xxx traffic originating from you on a work computer is not a situation i'd care to have to explain.