Playing With / Virginity Makes You Stupid

Basic Trope: A character who is virginal and stupid. Usually a Na´ve Everygirl or an Unlucky Everydude, and sometimes a Purity Sue.
Go back to Virginity Makes You Stupid, but this time, use the freaking doorknob.
http://tvtropes.org/pmwiki/pmwiki.php/PlayingWith/VirginityMakesYouStupid