ICarly effect
An unusual case in which a dorky boy becomes manly over the course of puberty. This also seems to blondes, so as to say water the crops. However, said effect leaves young maidens of the brunette completely unaffected.
Person1: What happened? Freddy got hot, Sam did too and Carly, meh.
Person2: That's the ICarly effect for ya.
Person2: That's the ICarly effect for ya.