A bit of an over the top comment, but his basic point is that subsidized birth control is akin to taxpayers paying for women to have protected sex. So, by Rush's logic, if we are paying for this woman to have sex, then she's a slut. I get it.
Plus, in an excerpt of the testimony, the woman states, unprovoked, "I am not a promiscuous woman," and in my experience, the biggest sluts are commonly the ones who feel compelled to let people know that they aren't sluts. :2 cents: