After reading everyone's responses, a few thoughts come to mind:
I agree that it's wise for all women to get vaccinated since they may get the virus from their husband and so end up infected even if they never had a sexual relationship with another guy. Even for women though, there should be no reason to get this vaccine as a child/teenager unless she is planning on having sex.
But for guys? A guy who is not planning on having sex doesn't need the vaccine. A guy who is planning on it should be old enough to give both his own concent to the doctor and an answer to God. I understand that his decision to have pre-marital sex won't be dependent on having received the vaccine, but I question why one is needed? Clearly the purpose of vaccinating a minor, before he is old enough to make his own decisions, is because you know that realistically, despite our teaching to the contrary, most young guys will have sex. So we want to protect their bodies (or in this case those of their future wives) even though we can't always protect their soul from mortal sin.
Let's suppose that the Pill was totally safe with no side effects. Would you put your daughter on the pill "just in case"? You teach her not to have pre-marital sex, but at the same time we are keeping our head out of the sand and know that realistically, given the statistics, the chances of her having sex are high. Would you put her on this safe pill to ensure that if she does happen to have sex, at least she won't get pregnant?