Seeing Galko's new lipstick, Otako explains that the lips have always represented the person's genitals.
Otako adds that you can also tell the condition of a person's genitals
by looking at the shape of their lips, to which Galko inadvertently hides her own lips.
You can check out the original comic here! http://info.nicovideo.jp/seiga/book_anime/#m1_gyaruko
Official Galko-chan Nico Nico Page and Episode List: http://ch.nicovideo.jp/channel/ch2617618
Episode 5 - "Is It True That You're a Big Sister?" : watch/1455778451
Episode 7 - "Is It True About the Boy at the Pool?" : watch/1456980131