It depends on whether you want to post to the gallery or just enjoy it privately, but here are a few little tips.
I don't really want to teach this so openly right in front of the admin (since they might patch it), but...
Even if it gets flagged as sensitive once, don't give up—if you try a few more times (without changing the prompt), you might succeed.
There is probably something like random number generation that causes high and low rolls. Also, the order of the prompts is important, and the results differ depending on whether they are in English, Kanji, Hiragana, or Katakana, or even if they are separated by "、 (Japanese comma)" or ", (comma)". It is a remarkably deep system.
Even if it doesn't pass the gallery review, you can still generate images with wardrobe malfunctions depending on the prompt. You can assume that 99% of dirty words in English won't go through. Japanese is incredibly convenient.
While "oppai" is completely blocked, "o ppai (with a space)" might go through. For Kanji like "胸 (breasts)" and "乳 (boobs)", the prompt order is crucial, and they get blocked sometimes and go through other times. But since that's a hassle, using hiragana like "pai" or "chichi" will work. For size, "big chichi" is probably a must. If you want to see a slip, first you should... (self-censored). Japanese really is wonderful.
I don't really want to show off these kinds of techniques since they might go against public order and morals, but...
As a fellow comrade fighting against this site's sensitive filters, I wanted to help you out a bit. It used to be unfiltered, though...