The penile shaft has no bones; erections are caused by blood flow.
When a man becomes aroused, his body responds by increasing blood flow to his genitals. This causes an erection, which can last...
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: Sexual arousal leads to erections: how blood flow creates firmness and flexibility
The penile frenulum is a highly sensitive area on the underside of the penis. It connects the foreskin to the shaft, which makes it an important part of male sexual anatomy. The frenulum plays a...
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: What you need to know about the penile frenulum and its importance for sexual pleasure
