The Desmond Morris book had been optioned for a film adaptation in 1968, and aside from some factual consultation, Morris was not involved in the screenplay writing. Initially set up at Universal, after initial screenplay drafts were submitted, the book was deemed unfilmable and was almost sent into turnaround, until Playboy magazine founder Hugh Hefner, who had been producing other film projects at the time, agreed to co-finance the project.
Leading lady Victoria Principal later said that her career momentum was hurt by the film's failure.[4][5]
Plot
In a series of satirical live action and animated vignettes, the evolution of humanity is depicted and explored, primarily through the experiences of Cathy, a tour guide in a natural history museum describing the ages of mankind and its advancement, and Lee, a college student who meets Cathy in one of his classes and grows infatuated with her. Through them, rituals of courtship, sex, marriage, workplace manners, and military service are dramatized, suggesting that despite centuries of change, certain behaviors remain constant.
