What distinguishes transvestism from other paraphilic disorders?

Transvestism is specifically characterized by the practice of cross-dressing, primarily for the purpose of sexual arousal and gratification. This behavior focuses on deriving sexual pleasure from wearing clothing typically associated with the opposite gender. In the context of paraphilic disorders, this distinguishes transvestism from other disorders that involve behaviors like voyeurism, which revolves around observing sexual activities, or sadism, which entails inflicting pain on others. Furthermore, transvestism does not inherently involve illegal activities such as engaging with minors, which is a characteristic of a different set of disorders. Thus, the distinguishing feature of transvestism is its emphasis on cross-dressing as a source of sexual excitement.