Action Comics (vol 1) #395 VG

The Secrets of Superman's Fortress (Superman, Lois Lane, Jimmy Olsen) --While showing Lois around his Fortress of Solitude, she notices a room forbidden to visitors. Within the room is a memento of Althera, leader of a race of Space Amazons, that Superman encountered on his way back from a space mission. On a remote jungle planet, Superman encounters some primitive natives enslaved by the Amazons. While aiding the primitives, Superman falls in love with Althera, leader of the Amazon race that are descendants of birds. Believing Superman is of the same race because he can fly, Althera falls in love with him too. When Superman explains they are actually of different species, Althera realizes there can be no love between them and the affair ends, but Superman still has strong feelings...