there are only 2 ways to have a large penis,
1. have a genetic history here there are large penis' in the family
2 or have surgery, which i understand is painful, and may effect performance and/or pleasure
Most guys are fixated on the size of their penis and yet most females could care less. In fact, most females dislike having sex with a fellow who has a very large penis.
My feeling is, it isn't the size that counts but the skil in how you use it. That skill coems from expereince and caring for the person you are with, (meaning satisfying her is more important that your satisfaction, if you r lucky u will find a woman who feels the same way)!