Ladies versus Butlers- What an erotic mess, it also the only anime that I had to skip an episode because it went too far.
Kanamemo- One of the best yuri anime, Haruka makes it extremely perverted but there are a few messages in it that can come in handy. "remember always use the restroom at the convience store not the park, because "things" happen in the park bathroom". What makes that quote so true is that Yuuki and Yume come out of the park outhouse together implying sex. The characters are all cute and upbeat.
Kojika- Never watched it myself but from people who have, I heard it was some serious nightmare fuel and is not even worth watching at all.