It seems that a content is not there yet. If you don't mind, drop us a line on what you've been looking for via the form below, and we might add missing content in a couple of updates.
Its exact function is unclear: it could just be a by - product of evolution, but some think it may help support the penis or stimulate the female during mating. (newscientist.com)
Wild animals: It can be a jungle out there on the roads, especially during mating season. (elephant.com)