“She’s like the Michelangelo of sex, drugs and rock’n’roll,” Pamela Des Barres once said of her friend and peer in penis admiration, Cynthia Albritton. Better known as Cynthia Plaster Caster, the 74-year-old artist died last week after battling a long illness. She was one of the last living “supergroupies” of the 60s and 70s US music scene, who built a reputation on their famous bonks and tell...