Why do men base their masculinity on penis size?

Senorita

New member
I've noticed that in many guys. Is it because of pressure from women, competition between men, or a little bit of both? Does it have to do with age (as in younger men put more emphasis on size)?

If you disagree, please explain why.
Out With a Bang: Of course it's a stereotype. But I'd like to know where it comes from and why.
 
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