How Can Penis Curvature During Intercourse Be Treated?

Thank you in advance for your time. My question is regarding my fiancé. He is a 34 year old man of overall good health. My fiancé has a bent penis. He states that his penis has been like this as long as he can remember. The curvature does not present until his penis is erect, when flaccid it appears straight. His penis curves toward his body and the bend is approximately 2 inches below the head of his penis. He is rarely able to ejaculate during intercourse. I am wondering if this may be a result of his curvature? I know that he enjoys sex with me, is a very passionate man, and we have frequent intercourse. We have been sexually active together for almost a year. I would like to know if this curvature causes a decreased sensitivity? He is able to make love to me for hours without ejaculating, but I want to be able to make him ejaculate! I want to please him! He says it is wonderful and feels amazing however...his inability to ejaculate is starting to cause me to be unfulfilled sexually, as I find pleasure in giving pleasure. Any advice is sincerely appreciated.