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the sperm does not carry 2 chromasomes. it carries either an X or a Y.
the egg always** carries an X.
if a Y-sperm gets to the egg, it's XY=boy. if an X-sperm reaches the egg, it's XX=girl.
the X chromasome is friggin huge, and the Y is pretty small, so sperm with an X chromasome will swim slower than those with a Y.
frequent sex makes males more likely. having sex within 36 hours can cause the speedier Y-sperm from the second ejaculation to reach the egg before the X-sperm from the first time, so the eggs gets hit with more Y-sperm than X's, so it'll likely produce a boy.
So if you want a girl, slow down.
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I:IV:XV
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