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An erection begins with sensory or mental stimulation, or both. The stimulus may be physicalâtouch, sound, smell, sightâor a sexual image or thought. When the brain senses a sexual urge, it sends impulses to local nerves in the penis that cause the muscles of the corpora cavernosa to relax.
Smoking can harm a man's sexuality and fertility. Heavy smoking is frequently cited as a contributory factor in erectile dysfunction because it decreases the amount of blood flowing into the penis. Smoking impairs sperm motility, reduces sperm lifespan, and may cause genetic changes that can affect a man's offspring.