Hard on theory

According to hard on theory men were the first to wear clothes.
In prehistoric times the headman would see a guy and think" that guy's got a hard on. He must be thinking about fucking my woman. I will kill him!".
So one day a guy got to thinkink" A lot of guys have been killed for thinking about fucking the headman's woman. How can a stop that from happening to me? I know I will cover up my pecker with animal skin and that way he can't tell when i'm thinking about fucking his woman. I will call it clothes".