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The perineal raphe is a small, vertical, slightly raised ridge of [[scrotal skin]] under which is found the scrotal septum. It appears as a thin longitudinal line that runs front to back over the entire [[scrotum]]. In humans and some other mammals the [[scrotum]] becomes covered with pubic hair at puberty.
The [[scrotum]] will usually tighten during penile [[erection ]] and when exposed to cold temperatures. One testis is typically lower than the other to avoid compression in the event of an impact.<ref>{{REFjournal
|last=Bogaert
|first=Anthony F.