Nude on the Moon, a sexploitation film co-written and co-directed by Doris Wishman and Raymond Phelan (under the shared pseudonyms “O. O. Miller” and “Anthony Brooks”), was released in 1961 and billed as “Man Discovers A Nudist Camp On The Moon!”
For reals? Well, it looks more like man discovers topless aliens in human form. But still, it was a giant step forward for pervs.