birth control
"The trade off is a few hours of real pain for 3 years of not having to worry about birth control. I have never had children and I'm 22 years old, so my cervix is really small according to my doctor. That's why the insertion, and the few hours after, hurt so very badly. However, since then I have felt no pain. I can't feel it ever. The best part is that my periods are incredibly light and only last one or two days! I am really glad I did this, and in three years I'll probably get another one."