What do you mean step by step? If you are attracted to someone sexually then you get aroused. And vice versa. Wait! This is an important question so if you feel like not having everyone see just PM me the answer. If you are a boy do you have an erection when you wake up in the morning?
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How do I know that I am aroused? Is that when the little thing goes into my belly button?
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I don't know what the hell is going into your belly button and this is obviously a troll so never mind.