Madonna, and it's not even closer.
1. Papa Don't Preach: she opened a very huge debate about the abortion in the 80's. The whole world get very mad at her.
2. Like a Prayer: the Papa call the world for banned Madonna. Who else? She also ****ed up to the most influential person in the world when it comes to the faith
3. The Blonde Ambition Tour: She kinda masturbate herself on stage :mess: And was banned in a lot of countries.
4. Justify My Love.
5. The Sex Book: is considered one of the most influential phenom in the fight for the female rights

Was a really, truly and very deeper theme of debate in the 1992. She was talking about the sexual life of the women, who could have their way in the middle of one of the most hypocrite and sexism society who get mad with a women talking about sex. I mean, US was (and is) one of the biggest industry for the **** movies and when the biggest artist in th world, where the women was nothing more than a sexual object to be used by males.
6. Erotica.
7... etc...