When a male is aroused sexually, the blood vessels in the penis relax and open up, allowing blood to fill them. Blood trapped under high pressure creates an erection.
When the blood vessels of the corpora cavernosa relax and open up, blood rushes in through the cavernosus arteries to fill them. The blood then gets trapped under high pressure, creating an erection.
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Physiology, Erection
https://www.ncbi.nlm.nih.gov/books/NBK513278/
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Chapter
00:00 Intro
00:15 How do I get an erection?
01:52 Is it normal to get a random erection?
02:07 How many random erections can a man get in a day?
02:32 How long does it last?
02:49 What can I do when I have a random erection?
03:17 Subscribe for more Urology content
