In November 1972, Keaton was a centerfold in the Italian men's entertainment magazine.
Or you might know her from the 1974 movie The Night Porter.
And of course many mature actresses who got naked on screen were also motivated by a larger pay check.
She got naked and rolled around in the mud in At Play in the Fields of the Lord, and she's similarly fearless in a scene here where she surprises a hot-tubbing Jack Nicholson by stepping into the Jacuzzi au naturel.