There are potentially quite a few factors which could contribute to this problem. With regard to the configuration of the penis, it may be that he has a congenital curvature resulting in the cobra shape or he may have acquired some scarring, particularly if rather vigorous intercourse
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This presentation sounds more like a congenital curvature of the penis, which is not associated with scarring and is typically a process, which results in a downward curvature known as chordee. If the curvature is significantly downward, it can make penetrative sex difficult to impossible and occasionally
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