It could be one of a few things. Either there could be some STD that passes from parrents to child during birth and youve always had it but the symtoms have yet to shown. In this case its fucked up they havent told you yet. 2. The pills could have some secret intoxicating feeling (not saying any of your parrents pop pills). or 3. your right, they think your going to get an STD eventually....but then why just that one type of med?