Johannes Bogaards and colleagues investigated whether vaccinating females only, males only, or both sexes is the best way to achieve reduction in HPV infections

The authors say: "Our results provide a justification, under most circumstances, for the intuitively plausible strategy of targeting intervention at the subgroups that harbor most infections and that act as a reservoir for transmission…We show that, once routine vaccination of one sex is in place, increasing the coverage in that sex is much more effective in bolstering herd immunity than switching to a policy that includes both sexes."
Source-Eurekalert