Actually, the content isn't the reason. It's a licensing issue. See, FUNimation first dubbed the first 13 episodes back in 1995, and they released them to home video. However, they weren't in charge of their own distribution then, so the tapes (and subsequent DVDs) were released by Trimark. However, the contract they entered into, for some reason had no clear end to it. So to this day, Trimark still holds the distribution rights to those episodes. So FUNimation redubbed those episodes in 2001 along with the rest of the series, and they were able to release bilingual DVDs for episodes 14-153, but they still can't release the first 13 episodes, which only exist in America in their heavily censored dub from 1995.