This is fron the "Penis Size" forum ; under knowledge base; here on CZ: 

Yes, size does matter. Anyone who tells you differently is not being completely truthful.

The majority of a woman's nerve endings are in the first couple inches of her vagina, so exactly how much size matters is a controversial topic. Most women agree that an average size penis, along with an understanding of her genital regions will get the job done. In fact, they would prefer that to a large penis as it could come along with a lot of pain for the first few times together for them.

For those dreaming for an 8+ inch penis, just remember that it doesn’t always come in as handy as you think. Having a large penis decreases your chances of your partner being willing to have anal intercourse, as well as deep-throating.

Although its nice to know how you measure up, what you have is what you have. There is much research going on in this area, as there is huge demand for increasing Penis Size , but don't count on a guaranteed solution coming out any time soon.

Learn to use your penis properly, and more importantly, learn how to please her without it. Skin is the body’s largest organ and it is filled with nerve endings. There are so many ways to pleasure your partner, from massages to cunnilingus, so learn how to be a complete lover, as you will always win over one that tries to rely on his size alone.