What is the most likely diagnosis for a man presenting with penile curvature and pain during erections?

The presentation of penile curvature and pain during erections is highly indicative of Peyronie's disease. This condition is characterized by the development of fibrous scar tissue in the penis, which results in curved and sometimes painful erections. The curvature can lead to difficulties during sexual intercourse and is often accompanied by discomfort or pain.

Individuals with Peyronie's disease typically notice changes in the shape of their penis, and the condition can have significant psychological and relational impacts due to the associated symptoms. The etiology is often linked to trauma or injury to the penis, which leads to the formation of plaque that causes curvature.

In this scenario, symptoms such as curvature and pain specifically during erections align with the typical clinical presentation of Peyronie's disease, making it the most likely diagnosis. Evaluation of the patient's history and the timing of symptoms can further support this diagnosis. Other conditions, like hypogonadism, erectile dysfunction, and priapism, have different presentations and would not typically cause the curvature and associated pain described in this situation.