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how the penis works The penis is a primary male reproductive organ. Its main functions are sexual intercourse and ejaculation of semen, as well as the release.. Discover the full library of 18+ content by subscribing to our Telegram channel. An erection is when a penis hardens and enlarges due to filling up with blood. It typically happens when a person is sexually aroused. how the penis works Discover the finest adult content on our Telegram channel—don’t miss out! What Makes a Penis Erect? Your penis has two chambers inside it called the corpora cavernosa. These chambers extend from the head of your penis deep into the pelvis. The insides of these chambers are made of spongy tissue and have the ability to gain blood volume and grow in size. Use the "open" button to become a subscriber and keep in touch with our amazing community. The nerve signals cause the muscles in the penis to relax and let blood flow into the spongy tissue in the penis. Blood collects in this tissue like water. Discover a hidden gem of sizzling adult content created exclusively for your enjoyment. An erection occurs when your penis fills with blood, causing it to expand and become firm. You might have an erection if you feel sexually.