Momoiro Sisters

School girls talking about "taboo" subjects, such as periods, shaving and sex. Ecchi fanservice that isn't centered in male characters. Short episodes.  

Comedy anime about the life of Office Ladies.  

90s anime with short episodes and dirty jokes. Frustrated Office Ladies dealing with sex and romantic relationships.  

*It's slice of life, where the main character is a schoolgirl. *Perverted heroines: in YK it's the main heroine and her female friend, and in MS it is main heroine's older sister. *Many intimate slice of life aspects, appurtenant to sex and physiology (like menstruation) are revealed and discussed. You can see the similar kind of slice of life in Futari Ecchi anime, however, FE is more mature and realistic. *Dialogues are also very similar. There is exactly the same kind of "humour". 

Feminine raunch abound. Period jokes, girls wanting to have sex just to have it, and some slight yuri subtext as well.