A few days ago, a patient experienced severe pain in his lower body during intercourse with his girlfriend in the early morning. At the time, his girlfriend was sitting on top of him. The intercourse was immediately halted, and he rushed to the hospital for medical attention. Fortunately, the examination revealed no serious issues, and the couple was relieved after the scare.

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Morning erection is a physiological phenomenon that occurs in males upon waking up in the morning. It is unique to men and is a common physiological response observed in males during puberty and sexual maturity.

Strictly speaking, morning erection is part of nocturnal erections, as it also occurs during sleep. The presence of morning erection indicates that a male has good erectile function.

During a morning erection, the corpus cavernosum is in a state of congestion and rigidity. If subjected to strong external force at this time, such as direct pressure from sitting, it can easily lead to corpus cavernosum injury. Mild injuries may only involve contusion of the corpus cavernosum, with symptoms and consequences that are not severe. However, severe injuries can result in rupture or fracture of the tunica albuginea, which is a more serious issue. Below is a brief introduction to these two types of injuries:

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1. Mild Injury: During a morning erection, accidental pressure from sitting may cause contusion of the corpus cavernosum. This can be accompanied by mild local pain, which may not be severe (though individuals with lower pain tolerance may experience significant discomfort). Typically, there is no obvious swelling or bruising. Such cases generally do not require special treatment and usually do not affect erectile function. Observation and self-recovery are sufficient, and medication is often unnecessary.

2. Severe Injury: Sitting on an erect penis during a morning erection can also lead to severe injury, such as corpus cavernosum fracture (sometimes referred to as "penile fracture"). In such cases, rupture of the corpus cavernosum often occurs, and an abnormal "cracking" sound may be heard in a quiet environment. This is followed by intense local pain, noticeable curvature of the corpus cavernosum, and significant swelling and bruising. If the injury involves the corpus spongiosum, it may affect normal urination, leading to symptoms such as difficulty urinating or bleeding from the urethral opening. In such situations, immediate medical attention is required rather than observation. Emergency corpus cavernosum exploration is necessary to locate the rupture and perform suturing repair, similar to patching a tire. It is important to note that surgery may also impact normal erectile function in the future.

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Therefore, while intimacy between men and women is natural and understandable, it is important to pay attention to methods and approaches. Especially when a male has a morning erection, direct pressure from sitting should be avoided. Blindly sitting forcefully on the male without any precaution can lead to corpus cavernosum injury, an outcome neither partner wishes to see.