Perelandra

In this second book in C.S. Lewis's space trilogy, the hero gets a quick trip to Venus courtesy of the "angels" he met on Mars. On Venus, he encounters the "Eve" character for the planet. Then, his nemesis from the first book shows up via his rocketship to play the role of the tempter.

The book has the religious overtones typical of C.S. Lewis, played out in a "lite" science fiction universe. The people, rather than technology, are the key here. (I'd almost consider it "interplanetary fantasy")