TRUE FACT:
Male sperm (Y) swim faster and die sooner than female sperm (X), because female sperm contain heavier genetic material, which slows them down but allows them to livelonger.
THEREFORE:
Males with longer penises tend to produce more male offspring because they deposit the sperm closer to the egg and Y sperm cells win the "sprint."
Males with shorter penises tend to have more female offspring because sperm is deposited further from the egg, Y sperm die off thus allowing X sperm to win the "marathon."
CONCLUSION:
Look at your family. This tells you whether or not your father had a big one.
