Do you have trouble holding urine? Do you have pain down there? Pain after a bowel movement?

All women lose some elasticity down there with age. When I had my PT, they would only do what was on the RX my doctor wrote .... It was a groin injury... but never did they suggest pelvic exams.

I think you have the right to refuse, or at least call your doctor.
If he did not order it, they shouldn't be doing it, without authorization.

You can do exercises yourself. One easy one is to start and stop a stream of urine several times during emptying. That's all that most of us need. (this is best done with a very full bladder).

Sounds odd to me. Don't be afraid to refuse if that is your wish.