Yeah some fans say the video and song are about the media slutshaming them but that is not true. I remember in interviews they would always talk about God and the gospel audience was pretty important.
"Nasty Girl" is about "a not-so-classy girl," as Williams puts it. "She walks out of the house with hardly no clothes on. She has on these hot pants and her butt is all out, and cleavage is all the way down south." The song is about letting young women know that "there's nothing wrong with being sexy, but it should be done in a tasteful way.
"Some stuff shouldn't be let out of the house. We wear hot pants. As a matter of fact, we wore some on the Soul Train Awards, but they covered our behinds and they came down a little longer than normal hot pants. We love to wear shorts and skirts, but it's got to be tasteful. It shouldn't be to the point to where you don't even hardly bend over and somebody sees your business. The song is saying how a real man is not going to want you dressed like that."