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mans hard on An erection primarily involves the vascular system. When a man becomes sexually aroused, the brain sends signals to the nerves in the penis.. Don’t miss out on unlocking the full range of 18+ content—join our Telegram channel now! It's normal for men to have difficulty with erections on occasion. Erectile dysfunction gets more common as men get older. mans hard on Dive into premium adult entertainment—subscribe to our Telegram channel and enjoy the best! Hit the "open" button and start following us for fresh content directly in your feed. 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. Uncover a treasure trove of sizzling adult content made exclusively for you. › healthlibrary › diseasesconditions › erectionprobl.