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Mud racing riding a 1948 Harley Davidson S-125 – found photo via ebay
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found photo via ebay
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Gloria Struck, circa 1944, on her 1941 Indian Bonneville Scout. – via NJ Monthly
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found photo via ebay
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Woman riding a motorcycle on route S3 in Southern California, 1952 – found photo via ebay
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Grace McKean joined the Motor Maids in 1956 and enjoyed having women rider friends.
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Caracus, Venezuela, February 1955 – found photo via ebay
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Motor Maids – via Maynard Hershon
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Gloria Struck of Clifton, NJ, shown with her daughter, Lori DeSilva, started riding in the 1940s, when few women rode motorcycles. – via NorthJersey.com 
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This 1920 photograph comes from the fantastic Museum Victoria collection, it depicts Glad Linaker, Lizzy Chinnery and Glad White sitting atop their v-twin motorcycles. – via Silodrome
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vintagegal:

Marlon Brando and Yvonne Doughty in “The Wild One” 1953
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This bike has been sent in by Bill McDonald. It shows his wife’s aunt on a 1930 Triumph CTT or TT. It was taken in Coventry, so the bike wasn’t too far from it’s home. Thanks to Peter Cornelius of the VMCC for confirming that is was made in November/December 1929 for the 1930 season.

via Vintage Bike
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Morgan, very long ago – via Flickr/Monokroom
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Italian actress and singer Maria Grazia Buccella sitting on a motorcycle. Rome 1970s. – via All Posters
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photo via Scooterlounge