How to Conceive a Boy

Some people claim that if a woman takes a dose of cough syrup a couple of hours before intercourse, she's more likely to have a boy. Supporters of this theory say that the medicine works by thinning the cervical mucous (just as it thins respiratory mucous when you have a cough), making conditions more favorable for sperm, especially those fast Y swimmers. The key ingredient that makes this work is guaifenesin, so if you're going that route, look for a product that contains it.