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The Ancient Egyptians thought that women with a greenish cast of complexion were more likely to have boys and were highly valued as wives.

Aristotle advised men to tie off their left testicles just before intercourse. He believed that the left testicle produced X sperm, and the right testicle produced Y sperm.

The Ancient Greeks took choosing sides of the bed to a whole new level. They believed that if men had sex while on their right side, they were much more likely to have a boy.

According to urban legend, a 700-year-old chart claiming to reveal the sex of a baby with over 90% accuracy was found buried in a tomb near Beijing.

The Shettles Method, developed in the 1960s, plays off the idea that female X sperm are stronger yet slower, and male Y sperm are faster yet weaker.

This method, which was developed by Dr. Ronald J. Ericsson in the 1970's, involves putting a sperm sample in a test tube on top of increasingly thicker layers of a protein called albumi.

o have a boy, you must have sex four to six days before ovulation. To have a girl, you should have sex a couple days before ovulation or even the day of.

Super-controversial but highly effective, this technique involves taking an egg from the mother and sperm from the father and combining them in a lab. After a few days, doctors analyze the chromosomes to determine the sex of the baby, and implant the

A laser is concentrated on sperm in vitro, separating out the X-chromosome sperm from the Y-chromosome sperm.