Philip Jose Farmer 
Lovers 

Escaping the religious tyranny of a 31st-century Earth by a fluke assignment to the planet of Ozagen, linguist Hal Yarrow found that the worst of Earth had followed him — Pornsen, his personal Guardian Angel, vigilant for any evidence of sin or wrong thinking.Conditioned by a lifetime of submission, Yarrow would have accepted Pornsen’s constant spying as an unpleasant necessity, had it not been for Jeanette, the beautiful but dangerously different fugitive he found hiding in the ancient ruins…