# What causes a third nipple?

**URL:** <https://boards.straightdope.com/t/what-causes-a-third-nipple/208533>\
**Category:** Factual Questions\
**Created:** [October 20, 2003, 4:30pm UTC](https://boards.straightdope.com/t/what-causes-a-third-nipple/208533 "2003-10-20T16:30:33Z")\
**Posts on this page:** 2\
**Page:** 3

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**Author:** ![Malleus\_Incus\_Stapes](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/malleus_incus_stapes/32/3293_2.png) [@Malleus\_Incus\_Stapes](https://boards.straightdope.com/u/Malleus_Incus_Stapes)\
**Post date:** [April 28, 2017, 3:42pm UTC](https://boards.straightdope.com/t/what-causes-a-third-nipple/208533/41 "2017-04-28T15:42:28Z")

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> [@Malleus\_Incus\_Stapes](#):
>
> Just to be sure, before I look them up, are those two words SFW to Google?

I took a chance and did look them up. I even looked on Google Images because I was having a hard time picturing what an extra breast might look like. And I was confused, because about sixty percent of the pics were of sponges.

Turns out that “Polymastia is a genus of sponges (Porifera) containing about 30 species.”

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**Author:** ![Darren\_Garrison](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/darren_garrison/32/92_2.png) [@Darren\_Garrison](https://boards.straightdope.com/u/Darren_Garrison)\
**Post date:** [April 28, 2017, 9:45pm UTC](https://boards.straightdope.com/t/what-causes-a-third-nipple/208533/42 "2017-04-28T21:45:34Z")

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> [@Malleus\_Incus\_Stapes](#):
>
> Just to be sure, before I look them up, are those two words SFW to Google?

Rule 34.

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