Gokujo.: Gokurakuin Joshikou Ryou Monogatari

Vulgar comedies (both visually and dialogue-wise) with girl protagonists that are certainly not shameful. 

The main protagonists in both anime do everything to be an attractive girl and they are only thinking about sex related stuff. If you liked B Gata H Kei you will probably like this anime too! Both are really funny and Ecchi. 

1. Both anime are about school girls which are very close to each other 2. No male cast. They’re both all female cast. 3. They both have yuri undertones 4. Pure comedy. Crazy laughing is guaranteed (too much dirty jokes :p ) 5. They’re both sweet and full of cuteness ,but thanks to a lot of dialogues and jokes with sexual subtexts, scenes vary from crazy to absurd (funny absurd :P ) 6. They’re very short (sadly, because surely you will ask for more).