Body parts we don’t use... MALE NIPPLES

Essentially, men only have nipples because they could have been female.

Males and females develop in exactly the same way for the first 60 days in the womb.

For those with a Y chromosome, testosterone will then start to kick in, which will cause male sex organs to develop instead of female ones.

By this point, though, you’re already going to get nipples. But because having nipples doesn’t actually do any harm, they have never been weeded out by natural selection – and so pretty much everyone still has them.

And if you didn’t know, men find their nipples are as sexually stimulating as women’s.