The Qur'an commands Muslim women to observe Hijab for it protects them from being sexually abused in the public. Also, there are some traditions which limit the relation of strange men and women in the public; because the free relation, as it is prevalent in the Modern countries, will pave the ground for sexual assault.
BBC reported “Baravalla” the biggest music festival in Sweden will be cancelled due to the reports of rape and sexual assault which occurred at the festival. [1] Also, Swedish comedian organized a “man-free” music festival in response to rape and sexual assault claims at festivals. Similar event took place in the UK. Recently, the Glastonbury introduced its first women-only venue called “The Sisterhood”. The organizers believed that “women-only” zones are necessary. Islam emphasizes on the division of strange men and women (Namahram) in the public and limits the relation between strange men and women, because it causes many social problems. Sexual harassment and assault are among the consequences of such free relations between these two genders.
[1] http://www.bbc.com/news/entertainment-arts-40504452