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The reason you get an erection is because your brain associates the characteristics of a girl with reproduction. as soon as that happens it releases hormones into your body that causes blood to engorge your penis with blood making it hard. it does this so that you are able to insert it into her vagina in an attempt to get her pregnant. This is probably the most urgent drive in the body.

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Q: Why does your penas get long and hard when you see prety girls?
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