Does Gardisal Vaccine work in men to prevent anal warts?

Answer 1

According to the CDC (Centers For Disease Control and Prevention):

"We do not yet know if the vaccine is effective in boys or men. It is possible that vaccinating males will have health benefits for them by preventing genital warts and rare cancers, such as penile and anal cancer. It is also possible that vaccinating boys/men will have indirect health benefits for girls/women. Studies are now being done to find out if the vaccine works to prevent HPV infection and disease in males. When more information is available, this vaccine may be licensed and recommended for boys/men as well."
http://www.cdc.gov/std/hpv/STDFact-HPV-vaccine.htm#hpvvac1

Answer 2

Good question - apparently, it's still under investigation. However, if I remember correctly, the virus types that are responsible for anal warts do at least overlap those that cause cervical cancer, so it would be logical to expect at least some benefit.