I remember when this was mildly common in the beginning and then it faded for a long time. Never did know what started it. I can only guess someone looked at the CD case art and made assumptions.
Random question but what's up with the sudden surge of Tailed Flandre?
Have you seen To-Love-Ru? You can get up to some really kinky shit with tails. I hate myself for this being literally my first thought, I hate to have to justify anything with a harem romcom.