David Beckham's sex strategy for a girl

David and Victoria Beckham will try having sex standing up in an attempt to guarantee they have a baby girl and not a fourth boy.

The Real Madrid star is said to be keen on having a baby girl and willing to try anything in order to get what he wants.

"He's found out through talking to people that you have more chance of conceiving a girl if you do things like have sex standing up on certain days of the month," a source told Grazia magazine.

It is also reported that Victoria has already picked a name for a baby girl- Luna. Article here.

I really wonder how this old wives' tale came to be true. Who noticed that girls popped out of women when people had sex standing up?