[From Wikipedia] The sexual revolution, also known as a time of sexual liberation, was a social movement that challenged traditional codes of behavior related to sexuality and interpersonal relationships throughout the Western world from the 1960s to the 1980s. Sexual liberation included increased acceptance of sex outside of traditional heterosexual, monogamous relationships (primarily marriage). The normalization of contraception and the pill, public nudity, premarital sex, homosexuality and alternative forms of sexuality, and the legalization of abortion all followed.
Here are some suggested readings:
Guy Talese: Thy neighbour’s wife. You could start from here. It gives a participant’s description of how it all started, including how the magazine Playboy initiated and the story of the Sandstone Retreat in California. Traduzione italiana La donna d’altri.
Betty Dodson: My Sexual Memory (previously titled My Romantic Love Wars, maybe the editor changed it to increase sales). A positive feminist https://en.wikipedia.org/wiki/Sex-positive_feminism, Betty is one of the ones that made the sexual revolution start. Betty (now eighty, I guess) has a website with funny and instructional videos on intimacy and sex issues www.bettydodson.com
Thomas Mayer Masters of Sex: The Life and Times of William Masters and Virginia Johnson, the Couple Who Taught America How to Love (also a TV series). A biography of two researchers that starting from the Sixties studied in the US the erotic physical response in men and women and gave us many of our current knowledge on this topic. Traduzione italiana
James Jones: Alfred C. Kinsey: A Life. A biography (also a movie) about Alfred Kinsey https://en.wikipedia.org/wiki/Alfred_Kinsey. Initially a zoologist, Kinsey shed light on sexual behaviors in the US in the Forties.
Cheril Cohern Greene: An intimate life, sex, love, and my journey as a surrogate partner
Xaviera Holland: The Happy Hooker. If you are interested to the life and thoughts of an escort in NY in the Seventies.
Catherine Millet: The Sexual life of Catherine M. In France, she is (or was) the well known director of an art magazine. She tells about her experiences as in group sex in Bois de Boulogne in Paris and surroundings. Traduzione italiana
Scotty Bowers: Full Service: My Adventures in Hollywood and the Secret Sex Live of the Stars.
If you are interested in autobiography, description of past way of living, sexual life, an all-time classic and my favorite is Giacomo Casanova: Historie de ma vie (History of my life). Available for free online in English and maybe in German, see the link.