anime about lesbians or sexuality?

An anime centered around lesbians:
Kashimashi: Girl Meets Girl
Revolutionary Girl Utena
Aoi Hana
Blue Drop
Candy Boy

Bonus--Anime about sexuality + lesbians. More like coming of age where young adults discover their gay side, transgender quirks, and the cruelty of life:
Wandering Son
(it starts part way into the story. Reading the manga will give you a better sense of what happened before.)

anime----->strawberry panic
manga---->houou gakuen

um alright o-o
-maria holic
-yosuga no sora
-R-15
-koe de oshigoto!
-kiss x sis

I could be wrong, but I suspect that you are too young to even be concerned about such a thing.

Yuru Yuri no sex but the characters shows signs of being lesbian(especially the girl with glasses)