Although condoms are highly effective for preventing the transmission of other sexually transmitted diseases (STDs), recent studies have concluded that condoms only offer partial protection, at best, against the transmission of genital HPVs.[28][29]

This may be due to the fact that HPVs can infect genital skin areas that are not covered by condoms. On the other hand, some studies have suggested that regular condom use can effectively limit the ongoing persistence and spread of HPV to additional genital sites in individuals who are already infected.[30][31]

Thus, condom use may reduce the risk that infected individuals will progress to cervical cancer or develop additional genital warts. A 2006 study of 82 college students suggests that condoms can be up to 70% effective for preventing genital HPV infection if used for every sexual encounter.[29] Both Planned Parenthood and the Centers for Disease Control recommend condom use to reduce the risk of contracting HPV
http://en.wikipedia.org/wiki/Human_papillomavirus