The female attains an orgasm when you stimulate her clitoris and her "g-spot".
Her clitoris is on the outside of her vagina so that's an easy one, whereas the "g-spot" is within the vaginal wall, about 4 inches from the opening of her vagina. If your erect penis is 4 inches, (approx. 10cm), then you shouldn't have to worry too much at all.
I have a 6 inch (15cm) penis, and I can't even get it hard enough for penetration. There is no use of having a decent to large sized penis if it doesn't work. Size doesn't matter. It's whether your junk works properly or not, that does. Stay healthy, don't smoke, and don't do drugs, and you're fine.
I think you are lucky that you have a small penis, I have a big one and get sick of it falling out of my boxers all the time, how about we swap?.
Just remember you get as much feeling out of your little one as I do out of my big one when reaching an orgasm, why worry, we get what we get, there is no known way to make a little dicky larger, all these claims of pills and potions to enlarge a penis should be sold off the back of a horse and cart because they are just snake oil salesmen and scammers, accept what you have and have fun with it.
I can just about guarantee you that there is no known way to increase your penis size.
Without even looking at them, I can tell you that these penis enlargements advertised by the above posters are all unproven, and may be dangerous to your health.
Your mental attitude needs to change, anyway, not your penis size. Instead of trying to get the biggest penis there is, why don't you learn how to use it in such a way as to make any woman you sleep with beg for more? Sure, it's normal to want bigger equipment, but far too many women I know talk about how men focus on size, and not skill. In their opinions, nothing is worse than a man with a big tool and no idea how to get a woman off. Those guys get their butts dumped real quick. On the other hand, more modestly endowed guys who are skilled lovers get the repeat business.
Morgannon
And here is all you'd want to know about how to enlarge your penis, from a forum of real people doing exercises: http://www.thundersplace.org/forum/showthread.php?t=28502
The average erect penis size in India is 13 centimeters (see http://www.ncbi.nlm.nih.gov/pubmed/17568760)
Don't Worry about your problem.
In our world this is the question that asked by many of men.
There is some good methods for your penis enlarging.
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Good Luck
the only way i know is surgery.here are some links.
http://www.srsmiami.com/phalloplasty-penis-enlargement.html
http://www.altermd.com/Penis%20Enhancement/girth_enlargement.htm