When you start having sex you’ll likely be exposed to the virus. Once you have been exposed, the vaccine doesn’t do you any good. The number of people in an age

When you start having sex you’ll likely be exposed to the virus. Once you have been exposed, the vaccine doesn’t do you any good. The number of people in an age cohort that haven’t had sex rapidly approaches 0 as that cohort ages into adulthood. Therefore, it is almost entirely offered to teens to try and vaccinate before they’re naturally exposed.