Pain during sex, suddenly. Never happened before...what's wrong?

It's not all that uncommon. Its called Dyspareunia. a href="http://familydoctor.org/online/famdocen/home/women/reproductive/sex-dys/669.html" rel="nofollow"http://familydoctor.org/online/famdocen/…/a Typically there is a medical or physical reason for it, but what it is, that needs to be determined by a physician.