Sounds like someone trying to manage a database with inadequate knowledge of both the database and the concept of GLBTQ - as in, trying to accomplish a relatively complex result in a search algorithm by doing something very very crude with database categories, based on the assumption that "gay" means "hardcore pornographic." Hence distinction between GLBTQ stuff and straight stuff; they realise that straight has subtleties, but apparently don't realise that for GLBTQ.