Interesting part in Fever

In chapter 2 of Fever, on page 38-39, there is a part that is interesting to me. When girl groups started to form there was a lot more attention brought around sex. In the mid-sixties the mainstream of rock was getting more involved in expressing ideas about sex. This is interesting because I did not think that girl groups started this, i always though it was guy singers that started singing about sex. The Rolling Stones did start singing about sex, but women groups did bring the songs into motion. The "sexy" music also traveled into movies and magazines.