X Chromosome - if you only have one, you poor thing, you're a guy. If you have two, then you my friend, are a gal!
to the gals ~ It is important to remember that we, we gals that is, aren't missing a Y, we've got double of the good stuff. So when guys come whinging around saying they're better because they have a Y - you just jump up and say "we don't want your stooooopid Y - we have double kisses - you have double nothing!" Remember Y is for Y-front, and X is for kisses, and Jesus, and where the treasure is buried. They are JEALOUS. But best not say anything, just give them that quiet Mona Lisa (double x there!) smile and that will be enough said.