There is probably no other part of the male anatomy that men scrutinize the most than their penis.  If it is not perfectly straight when erect, a man may wonder is this normal or not.  To set the record, uh, straight, a slight curve or tendency to lean to the left or right when erect is considered normal.  But, if the penis has a significant bend that is more noticeable, then it could be a condition called Peyronie’s disease.