Dear Asad, Hi, I have gone through your question and understand your concerns regarding perceived small penis. Concern regarding penile size is as old as human race. The width and length of penis vary greatly from one individual to another. The normal length of vagina is about six inches. Only outer one third and the front wall of vagina have nerve fibers and hence sensitive to stimulation. Rest of inner two third is largely insensitive. So if you want to arouse your partner during sex, you should focus on the areas of maximum nerve endings hence clitoris and inner lips or labia minora, the outer wall and outer two third of vagina. So for female sexual gratification, the size of erect penis could be anything from two inches or more! You remember that what important is strength and not the length! Entry and to and fro continuous movements are adequate to enjoy coitus and to reach orgasm. It is your technique, not your penis size that characterizes the lover inside you. Bigger is better is Godzilla logic. An occasional episode of erectile failure due to functional or situational reasons like fatigue, tension or own pressure to perform rather to enjoy is very common. This diminishes arousal level and hence erection too. This seems in your case. Remember, sex is largely something what happens between two ears rather that between two legs. Hope, I have answered your question. If you have any further questions I will be happy to help. Wish you good health.