The penis becomes fully erect, allowing manual stimulation or vaginal, anal, or oral sex to occur.Ī variety of physical or psychological issues can prevent an erection from occurring or lasting long enough for sexual activity. The brain and nerves continue to send more blood to the penis and restrict blood flow from it. Erect penis: The penis becomes erect as visual, imaginary, or touch stimulation continues.The penis starts to swell during this phase. Swollen penis: Sexual stimulation causes the brain and nerves to change the blood vessels and other tissue of the penis so that more blood flows into the penis than flows out.During this phase, blood flow to and from the penis is equal. Soft or flaccid penis: This is the penis’s “normal” state, and it occurs when there is no sexual arousal or stimulation via sight, touch, or fantasizing.Share on Pinterest A number of factors can affect how long a person can stay erect.Īn erection occurs when the blood flow to the penis increases, causing it to change shape and size.
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