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A bird penis is different in structure from mammal penises , being an erectile expansion of the cloacal wall and being erected by lymph , not blood.

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It’s TWICE as long as you think and why you wake up with an erection – 9 penis facts revealed

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The state of a penis which is partly, but not fully, erect is sometimes known as semi-erection clinically: partial tumescence ; a penis which is not erect is typically referred to as being flaccid, or soft.

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Parasympathetic branches extend from the sacral plexus into the arteries supplying the erectile tissue; upon stimulation, these nerve branches release acetylcholine , which in turn causes release of nitric oxide from endothelial cells in the trabecular arteries.

Description: By using this site, you agree to the Terms of Use and Privacy Policy. Erection subsides when parasympathetic activity reduces to baseline.

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