The relationship between nudity and sexuality can be complicated. When people are nude, this often leads to sexual arousal, which is why indecent exposure is often considered a crime. There are also social movements to promote a greater degree of nudity, such as the topfreedom movement to promote female toplessness, as well as the movement to promote breastfeeding in public. Furthermore, some psychiatric disorders that can lead to greater nudity include exhibitionistic disorder, voyeuristic disorder, and gymnophobia.