Greg Cox wrote:
Look at Logan's Run, which was filmed a few years earlier. Logan and Jessica go for a PG-rated naked swim . . . .
And Jessica changing into furs in the "ice cave" or whatever it was. Of course the Franco Zeffirelli Romeo and Juliet
, which many boys my age sat through solely because they'd heard about Olivia Hussey's brief toplessness, was originally G-rated.
Heck, Charlton Heston and his fellow astronauts went for a "naked swim" in Planet of the Apes
way back in 1968.