Possibly unrelated historical fact: There has been an extensive history of interracial sexual slavery dating back to the 1490s in American history. There even was a painting from 1632 by Dutch Golden Age painter Christiaen van Couwenbergh (picrel) depicting such acts.

TL;DR - Blah blah blah, may be a coincidence, but history may be repeating itself, but just for anime girls instead of slaves. Any objections?