Elizabeth Mavor, in her study of the Ladies of Llangollen, offers as a motivation for the rise of Romantic Friendship, that women could not achieve with men the ideal of equal Platonic friendship, and so turned to other women. But Faderman notes that 17th century writers (some female) considered such heterosexual equality possible. Even so, the general sense on both sides was that men and women existed in such different spheres (both by practice and because of beliefs about their inherent natures) that reaching across the divide was difficult.