Full Idea
Women can very well enter into a friendship with a man, but to maintain it - a little physical antipathy must help out.
Gist of Idea
Women can be friends with men, but only some physical antipathy will maintain it
Source
Friedrich Nietzsche (Human, All Too Human [1878], 390)
Book Reference
Nietzsche,Friedrich: 'Human, All Too Human', ed/tr. Faber,Marion [Penguin 1994], p.196