Other areas covered include different ethnicities, sexualities, genders, and abilities. Ellen Samuels explores gender, queer sexualities, and disability. This novel has been praised for representing characters of various ethnicities, genders and sexualities. Nevertheless, there are drag artists of all genders and sexualities who perform for various reasons. Pornography can teach awareness and can foster acceptance towards personal identities, sexualities and bodies. Ultimately, Butler's inclusion of alternative sexualities serves to erode rigid hierarchies. In such countries there is often strong criticism of non-traditional sexualities and sexual liberation. In terms of LGB sexualities, this would fall under sexual diversity. Kinsey rejected the notion of a clear-cut line between different sexualities. Students at Korean universities experienced difficulties with being open about their sexualities. In the 1990s, stories depicting alternative sexualities experienced a resurgence. The app offers a choice of 23 sexualities.