Jane Fonda, now 73, was once an international sex symbol and then one of the most famous -- and most hated -- celebrity activists. A new biography details the star's open marriage to her first husband, French director Roger Vadim, who also romanced Catherine Deneuve and Brigitte Bardot.

The book reads like a who's who of the Swinging '60s: Fonda partied with Dennis Hopper and Jack Nicholson and indulged in threesomes to please her husband.

Biographer Patricia Bosworth, who's also profiled Marlon Brando and Mongomery Clift, shares a lengthy excerpt of her new book on Vanity Fair's web site. The section focuses on Fonda's time in France and the making of the cult film 'Barbarella' (see above) and details her sexual and political awakening and desire to carve out an identity other than "Henry Fonda's daughter."

Check out some highlights: