Vaginnisums is the term used for a condition that affects a woman’s ability to engaged in any form of vaginal penetration. This includes not only intercourse, but also use of tampons, or getting routine gynecological examination. The vaginal muscle becomes spastic in an involuntary way, which makes any penetration either very painful or impossible. (From Wikipedia).
People tend to believe that with the sexual revolution, and the widely available knowledge about sexuality, this kind of dysfunction no longer exists. This is not the case; I have come across the conditions several times in my practice just in the last year.
We do not hear about the condition, possibly because of shame or maybe because there is no pharmacological solution available, so there are no ads from the pharmaceutical companies.
However, the good news is that it is quite easily treatable. All the women that I have seen with this condition, and that have persisted with treatment, succeeded in overcoming their issue and were able to have an enjoyable sex life.
The treatment consists in learning to relax the pelvic floor and vaginal muscles, and using dilators in increasing size to learn how to get used to penetration.
You can buy the dilators with instructions from Vaginismus. It is highly advisable to use specific physical therapy that addresses this issue. In my vicinity, you can find qualified physical therapists at the University of Michigan health center. . If the issue has already created stress in the relationship and secondary emotional issues, it is important to consult a qualified sex therapist.