I've done this before. My main account's linked to an ID I use in some con-going circles, and I'd really rather not have people I know IRL knowing I write some really filthy porn, since some of them have zero concept of boundaries. At the same time, orphaning or permanoning a porny Yuletide fic makes me feel like a judgmental asshole, so if I write Yuletide porn, I transfer authorship to my pornsock after my assignment's been logged as fulfilled, but before author reveals.

I've never gotten in shit for it, but my pornsock doesn't moonlight as a dentist, so there's no real reason for anyone to look askance.