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An erection may happen at random times for no reason when there is a lot of blood flows into a The penis is the most common reproductive and excretory orga..., making it bigger and harder. It may curve up, down, to the side, or straight out at a right angle. This may happen at any age but happens usually during puberty. An adult experience this while they are sexually aroused, may show up in one’s sleep, or first thing in the morning.