As far as I have learned it was not tested for boys, and that is why it has not been approved. Perhaps testing has now or is being done. But that was my first question. Why only girls?
susie
Because the strains of the HPV virus that Garadasil protects against account for something like 70% of cervical cancer cases (the number two cause of cancer-related deaths in the world for women and the number one cause of cancer-related deaths for women in the developed world) and 90% of all genital warts. According to the CDC, something like 80% of women will have contracted at least one strain of HPV by age 50 (though most strains are harmless and don't even lead to symptoms)
Some strains of HPV can cause throat cancer and penis cancer, but these kill many fewer people.
So, it makes sense to focus on testing this vaccine on women because, due to the cervical cancer connection, HPV is much more deadly to women than men (the majority of men with HPV don't even exhibit symptoms).
That being said, I'm sure the vaccine will end up being approved for men.