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Your worry is understandable but the scientific truth regarding your concern will not allow you to be worried anymore! The width, length and erection of the penis vary from male to male. If you think that increased penile strength gives more satisfaction to female partner during sexual act, then your belief is not correct. It is only the outer 1/3rd of the vagina, which is sensitive to coitus; while the upper 2/3rd is not. So, even a small penis is capable of performing the sexual act in a satisfactory manner for both the partners. It is not the size but the attitude, which you nurture, which may impede a satisfactory sexual relationship.