Well, boys don't get cervical cancer, but I'm sure as soon as Merck can conceive of something to protect boys from themselves for $350 a pill, they'll force that down our throats too.
Boys get HPV infection in the form of genital warts and can spread it to females who in turn get cervical or oropharyngeal cancer. Boys and boys together (it happens even in Texas) can cause oropharyngeal and anal cancers.
But they certainly can spread HPV, so why not have them vaccinated.