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Models Barbara King and Donna Mae Brown, 1950s.

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Virginia Biddle, 1927, photographed by Alfred Cheney Johnston

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A simulation of the moment after orgasm, from photographer Bettina Rheims' "Like a Woman" series. 4/6.

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More Joan Zinn, 1964

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Actress and social provocateur Anita Berber, Weimar Germany, ca. 1920

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Jewish model Roberta Pedon, 1970s

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Two Jewish nude models dressed in American Western costume. Donna Mae Brown (left) and Gertrude Bloch (right), 1950s

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Jewish model Rachel Minkowitz, 1950s

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Donna Mae Brown, 1950s

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Gertrude Bloch removes her bra, 1950s

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Jewish nude model and burlesque performer Elaine Jones, 1960s

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Jewish nude model Donna Mae Brown, 1950s

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Susan Bernard, Dec 1966 Playboy Playmate of the Month (Gut yontiff to all now let's let's go get-i some spaghetti)

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Actress and model Elaine Collins, 1970s.

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Joyce Wagner, 1960s

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Nude, 1950s, Andre de Dienes

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Anonymous French postcard

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Model Miriam Ortiz, 1950s

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Nude Model Janet Lupo

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"Good Home Cooking" with model Sigurd Grünberger, shot for Odiseo magazine's Autumn 2013 issue

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Margaret Nolan, 1960s, by photographer Harrison Marks

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Nude model Ann Austin, 1960s or 70s

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Nurse Rowena Clark, 1987, by Donald Milne for Mayfair

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Model Angela Duncan, dressed as nurse, 1974

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Two nude women in a hollow tree trunk, Bagby Hot Springs, Oregon, 2007, David Levine

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Ziegfeld Follies Girl with Hula Hoop, ca. 1928, Alfred Cheney Johnston

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Unidentified model, probably from 1956

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Nude model Nancy Gates, 1960s

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Nude model Jennifer Garland, 1960s, by Harrison Marks

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''Young lady squeezing orange,'' Soltando Madonne series, digital media, by Mariano Vargas

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''Nude with Sunray Lamp'' with model Lee Miller, 1929, by Man Ray

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Actress Laura Antonelli in "Il merlo maschio," 1971

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Standing Female Nude, ca. 1860, by Nadar

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Weegee shooting nude models in desert, Southern California, by Frank Pearce

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La Rose Giuseppe, 2014, by Alice Taylor

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Natalie Tohare, 1950s, by Bunny Yeager

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Anonymous French postcard

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Erotic model, ca. 2011, by photographer Ed Ross using 19th C. wet plate photography

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Tintype, ca. 2012, by photographer Ed Ross using 19th C. wet plate photography

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One breast exposed, ca. 2012, by photographer Ed Ross using 19th C. wet plate photography

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Model Mylen, photographed by Ed Ross in 2010 using 19th C. technology.

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Nu allongé, 1950, Andre De Dienes

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Peggy Winters,1950s

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Portrait photograph of Miss Ernani Seibel, 1919, Arnold Genthe

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Dondi Penn, Dec. 1960, in Escapade Magazine

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Nu féminin allongé sur un canapé Récamier, ca. 1856, Gustave le Gray

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Helga Genthe, 1960s, by Peter Basch

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Ruth Lager, 1950s

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Collinson Twins, ca. 1971.

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''Moving Angel,'' ''Ode to Women'' collection, Tina Trumpp

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Model Nikki poses in Nicasio Reservoir, 2010, photographed by Ed Ross using 19th C. technique.

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Reagan Wilson, 1967

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Sally Lux, 1950s

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Posing nude woman, 1890s, Alfred Cheney Johnston

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Andrea Rau, 1960s, by Peter Basch

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Vicki Palmer, ca. 1960

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Kristine Blindfolded, Golden Nudes, Guido Argenti

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Renie Said, 1970

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Ruth Lager (left) and Sally Lux, 1950s

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Unidentified nude models 7, possibly ca. 1970

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