Should a girl be informed about the curvature of the penis and its potential effect on intimate relations, and what is the optimal course of action in this situation?

Scholars have differed regarding the nature of defects that must be disclosed. The majority of jurists restrict them to defects that impede intercourse, or repulsive and contagious diseases. While Ibn Al-Qayyim and Ibn 'Uthaymeen hold that a defect is anything that does not achieve the purpose of marriage. So, if the defect affects enjoyment, it is preferable to disclose it to avoid disagreement and prevent future disputes.