Movie poster for Prehistoric Women (aka Slave Girls) (1967, UK)
And here is a publicity still (dated 14 Jan 1966) from the film featuring the actress Martine Beswick which was obviously an inspiration for the poster art
Editorial: "Nude Men in Couture Hats"
Model: Carter C., Oren and Ryan, Nick Lacy, Cody Saintgnue
Photographer: Giuliano Bekor