Speaking as an "actual" sexual assault survivor (not rape, but still a high traumatic experience; I would rather not go into the details), I would not be offended if someone referred to this as medical sexual assault. Granted, I only represent a single data point, but this kind of ranking of sexual assault really pisses me off. All unwanted touching, groping and penetration is traumatic, and how badly a person reacts doesn't work on a linear scale -- it's belittling to say, "Oh, what would REAL victims of rape/sexual assault/whatever think about this!?"
The coercion is at the hands of the government. The fact that the doctor is merely following the law does not alter the fact that this has the potential to traumatize countless women. This is medical assault, period.
And comparing this to a pap smear is ignorant as hell. It's not the discomfort that's the issue -- many medical procedures range from unpleasant to downright excruciation. It's the fact that women are being coerced into an invasive, uncomfortable procedure that's the real problem here. Last I checked, there aren't any laws forcing women to get pap smears.