Why are some men insecure about their penis size?

tangledlover
I've seen some questions on here that indicate penis insecurity, & I didn't really know men were concerned about that.

So, a general queston, why are some men insecure about their penis size? Have you had some negative experiences that resulted in your opinion, or do you just not like your body?
Why are some men insecure about their penis size?
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