Courtesy of Gary Denke's find below
http://www.admin.ox.ac.uk/po/050919a.shtml

Since its the sperm that decides the gender, why stop at Green? Future boffins are sure to include blue, denoting a boy, and pink for a girl.

Resulting in the following family conversation of
the future.
"Too many teeny greenies, darling" She said, using the optical hand-held vaginal speculum.
"Very few teeny blues either, hand me the acidic douche sweetheart, we'll try again tomorrow"