Verified answer

Kind of, yes.

The hymen is a narrow band of tissue around the vaginal opening, over time it can wear away or stretch - normally there's enough room for something small like a tampon to pass through without effecting the hymen, but tampon use, masturbation, and sexual activity can stretch the hymen. During sex the penis can usually pass through the hymen without problem, as long as it is slow and gentle - the hymen rarely causes a problem when it comes to sex, issues normally only arise if the women isn't relaxed or aroused enough during intercourse.

More information;

My Corona: The Anatomy Formerly Known as the Hymen & the Myths That Surround It - http://www.scarleteen.com/article/body/my_corona_t...

No, your vagina has some kind of opening, whether it is big or small. It is usually big enough to fit a tampon without it being stretched. It may be stretched a small bit, but that would be all. It wouldn't have any affect on your sexual life unless you used an ultra or super-plus size.