As humans' closest living animal relatives, it's only natural that chimpanzees would also use sexual aids to attract mates.  Many animals use crude external tools, mostly to attain food, but chimps use the widest variety and most complex forms. Bonobo chimps are even similar to humans in that they are one of the few animals who appear to have sex purely for pleasure. With all these similarities, it seemed only a matter of time before our hairy animal cousins discovered how to use tools to attract sex partners.

As reported by Phyorg.com, Tanzania based researchers witnessed male chimps playing with dry leaves in front of their erections, utilizing the sound of the leaves breaking to