I am a young man in the prime of my sexual life, and I, too, have a downward-curving penis. I cannot offer an answer as to how common this may be, but to me, it seems odd that it would go any other direction.
User Detail :
Name : Albert, Gender : M, Sexual Orientation : Straight, Race : White/Caucasian, Religion : Christian, Age : 19, City : Huntingdon, State : PA, Country : United States, Occupation : Student, Education level : High School Diploma, Social class : Middle class,