beta
CONSPIRACY THEORY TIME :
ALPHAS have BIG cocks because if male omegas developed the ablility to give birth later in human evolution. It would make sense that they do not have muscles to move to sperm to the utrus . Hence the alphas with big cocks passing their genes .
Also makes sense why so many alphas have big dicks , because small beta male dick wouldn't be able to make in contact with the Omega Utrus and hence not being able to fertilize it.