Lin Peh has some graphics on the positions to use during lovemaking to ensure the sex of the baby. It does have some truth in it. You see, the Y chromosomes in the sperm that makes a baby boy tends to die faster. So if you screw in the woman on top position, Newton’s Law comes into play and the sperms have a tougher time swimming up the cheebai to meet the egg. In that mad rush, as in any rush for something free, the female chromosomes, or X chromosomes if you like to be bit scientific, always wins the race. The male or Y chromosomes always looses in these kind of mad rushes. In the process of swimming that holy channel upwards, the female chromosomes will reach the egg first. So voila, you have a baby girl!

Alternatively, if you farked the man on top style, the sperms has an easier time swimming downwards. As this don’t take so much effort, the Y sperms have a very good chance to reach the egg first. It only takes one chromosome among the millions realeased by your maker to make you.

However, there are some who just can’t conceive no matter what positon they use. What happened? My grandma says it’s because that guy has no shooting power. What shooting power?! Believe me or not, but the sperms shoots out at 45kph! This sheer speed will catapult the sperm into it’s intended journey. If a guy has no shooting power, then he might be shooting like o.5 kph. That’s almost like dripping! Where can get pregnant like that? Before the sperm can reach the egg, all dead already. So what is the advise Great grandma gave? Easy, immediately after you have shot your load, grab your partners ankle, turn her upside down and give her a good shake. This will ensure all the sperms go down quickly on it’s intended path. You will have your baby, sex undetermined.

Wanna to know more? Here is one nice article.