Keeping your cool

And we mean both literally and figuratively. According to some stories, being relaxed when you conceive means you'll have a girl; if you're a worrywart, a son's in your future. But actual temperature may play a role, too. Some old wives say a man's testicles should be cool before you have sex if you want a daughter; for a son, warm them up. That plays into the common belief about boxers versus briefs — go for the tidy whiteys if you want a boy, but hang loose if you're aching for a girl. (FYI, research does suggest that boxers are best for baby-making in general.)