Radical feminism has many strands: Some embrace a more 'pro-woman' position, emphasising positive differences between women and men, and sometimes the superiority of women in a sisterhood. Cultural feminism seeks to retreat altogether from what they see as a corrupting male world of aggression and violence, saying "men are the enemy" - Susan Brownmiller. Some advocate political lesbianism, like Ti-Grace Atkinson, with heterosexual behaviour being "male identified" - men keep women in a "constant state of fear of rape".