Chart your cycle. Learn how to predict/tell when you are ovulating. The closer you have sex to the time you ovulate, the better your chances are of having a boy. The theory is that sperm that contain the boy chromosomes swim faster and die faster. Girl sperm swim slower and take longer to die. So if people want a girl they recommend havng sex a few days before so that all the male sperm are dead by the time you ovulate. For you it would be vice versa. I don't know quite how well this works, but I have read it quite a few places. Plus its what happened to me. 1st time I had sex the day I ovulated and had a boy. THis time I had sex 2-3 days before I ovulated and I'm having a girl. It's the cheap way to try for what you want....or you could shell out $25,000 and try the scientific way.