@jimq2Here on SOL, Lazeez knows ALL the various pen names, though finding published author's pen names are more tricky, however those are widely discussed in the industry, and are thus easier to track over time.
For a long time I published using two different one (published using one, posted using another) and having written a couple of alternate rape stories (similar to my older pseudo-incest stories), I was strongly considering yet another pen name for those (though the recent support here has ultimately convinced me not too).
Though even if I had, I'd have used the alternate pen name, yet on the last page of the stories, you'd see the link to purchase the novel, under my own name, so that's more of hiding in plain sight.
But historically, pseudonyms weren't used as much for porn, it was mostly to prevent your most loyal fans from abandoning you, assuming you were abandoning them, so mostly, anytime you'd write in a new genre, they'd inevitable create a pen name just for that. And again, the publishers were fully aware of who was who and which names they used for which books even if it wasn't published by them. So Lazeez's role is the same as it's always been throughout history.
Though in the case of classical porn, if you informed your publisher what you were writing, they could be forced to testify against you in court, so no one told their publishers for that reason alone.