Anus
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The anus is an opening to expel fecal matter from the body. In humans it is kept closed by the sphincter, a ring of muscle surrounding the anus. From the anus originates also the humorless fart.
The anus is the orifice used for anal sex and is then a collector of semen or std.
Humans talk with their anus, while most animals eat with their mouth. See protostome and deuterostome.
Pointless Biological knowledge
Interestingly the mighty flatworm does not have an anus. Instead it just has a mouth. With this 'mouth' it both eats and defecates.
