The scrotum and labia majora develop to have both similarities and crucial differences. Like the scrotum, labia majora after puberty may become of a darker color than the skin outside them, and, similarly, also grow pubic hair on their external surface (the female genitals on accompanying photos are shaved to show their structure clearer). But, during sexual differentiation of the foetus, labioscrotal folds in the males normally fuse longitudinally in the middle, forming a sack for male gonads (testicles) to descend into it from the pelvis, while in the females these folds normally do not fuse, forming the two labia majora and the pudendal cleft between them. Female gonads (ovaries) do not descend from the pelvis, thus the structure of labia majora may seem simpler (just fatty tissue covered with skin) and of lesser significance for functioning of the female body as a whole than the scrotum with testicles for males. The ridge or groove remaining of the fusion can be traced on the scrotum.