Strange behavior of my body organ?!

Question: Strange behavior of my body organ?

Ok sometimes when a girl touches my penis, or scratch or tickle my balls my penis become bigger and hard. Why does that happen?

Answers:

Blood is rushing towards your penis and filling the spongy tissue (the tissue your penis is made of) as this spongy tissue fills with blood it gets harder.

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Strange behavior of my body organ?!

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