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Unfortunately, there is no evidence that immunization at your age will do any good. Evidence only shows the immunization during childhood is protective against HPV. Most sexually active people are infected with HPV. However, not everyone develops any signs of HPV including warts or cancer. You can't live the rest of your life being scared about the development of these types of cancers. Your significant other just needs to have an annual Pap smear. There's no way to determine what your odds are of developing cancer. There is no screening test for any of these cancers either. Hope this helps and let me know if you have questions.
I believe the reason is that because most adults who have been sexually active have already been exposed to the virus and once you have been exposed, the vaccine is no longer effective.