FEMEN is a Feminist group originating in the Ukraine. They often stage protests against oppression of women and especially oppression that stems from Islam and it's Sharia Law. Sharia Law considers women as less than men, therefore women have less rights (if any) to men.
FEMEN staged protests might seem frivolous but they are not. They are non-violent except when the violence is perpetrated against them by Muslims who are outraged by the public exposure of female breasts.
The issue FEMEN raise is extremely serious, the infiltration of Islamic values in the western world. It is usually ignored by politicians who prefer to follow the "multicultural" agenda which is really just pandering to the whims and demands of Muslims.